diff --git a/app/src/main/java/im/vector/riotredesign/features/home/RoomDetailFragment.kt b/app/src/main/java/im/vector/riotredesign/features/home/RoomDetailFragment.kt
index 892b741ed1..18ef510c5d 100644
--- a/app/src/main/java/im/vector/riotredesign/features/home/RoomDetailFragment.kt
+++ b/app/src/main/java/im/vector/riotredesign/features/home/RoomDetailFragment.kt
@@ -43,6 +43,7 @@ class RoomDetailFragment : RiotFragment(), TimelineEventAdapter.Callback {
         super.onActivityCreated(savedInstanceState)
         setupRecyclerView()
         room = currentSession.getRoom(roomId)!!
+        room.loadRoomMembersIfNeeded()
         room.liveTimeline().observe(this, Observer { renderEvents(it) })
     }
 
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/MatrixCallback.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/MatrixCallback.kt
index 5106a4cb11..db85de5ccf 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/MatrixCallback.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/MatrixCallback.kt
@@ -4,8 +4,12 @@ import im.vector.matrix.android.api.failure.Failure
 
 interface MatrixCallback<in T> {
 
-    fun onSuccess(data: T)
+    fun onSuccess(data: T) {
+        //no-op
+    }
 
-    fun onFailure(failure: Failure)
+    fun onFailure(failure: Failure){
+        //no-op
+    }
 
 }
\ No newline at end of file
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/Room.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/Room.kt
index a9055c4d57..febe786c91 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/Room.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/Room.kt
@@ -4,6 +4,7 @@ import android.arch.lifecycle.LiveData
 import android.arch.paging.PagedList
 import im.vector.matrix.android.api.session.events.model.EnrichedEvent
 import im.vector.matrix.android.api.session.room.model.MyMembership
+import im.vector.matrix.android.api.util.Cancelable
 
 interface Room {
 
@@ -15,4 +16,5 @@ interface Room {
 
     fun getNumberOfJoinedMembers(): Int
 
+    fun loadRoomMembersIfNeeded(): Cancelable
 }
\ No newline at end of file
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/Membership.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/Membership.kt
index 8bb57b15c5..81cdd00d1b 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/Membership.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/Membership.kt
@@ -2,12 +2,21 @@ package im.vector.matrix.android.api.session.room.model
 
 import com.squareup.moshi.Json
 
-enum class Membership {
+enum class Membership(val value: String) {
 
-    @Json(name = "invite") INVITE,
-    @Json(name = "join") JOIN,
-    @Json(name = "knock") KNOCK,
-    @Json(name = "leave") LEAVE,
-    @Json(name = "ban") BAN;
+    @Json(name = "invite")
+    INVITE("invite"),
+
+    @Json(name = "join")
+    JOIN("join"),
+
+    @Json(name = "knock")
+    KNOCK("knock"),
+
+    @Json(name = "leave")
+    LEAVE("leave"),
+
+    @Json(name = "ban")
+    BAN("ban");
 
 }
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/util/Cancelable.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/util/Cancelable.kt
index e8092d7271..c83dc88b4c 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/util/Cancelable.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/util/Cancelable.kt
@@ -1,5 +1,8 @@
 package im.vector.matrix.android.api.util
 
 interface Cancelable {
-    fun cancel()
-}
\ No newline at end of file
+    fun cancel() {
+        //no-op
+    }
+}
+
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/RoomEntity.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/RoomEntity.kt
index 44daadeda7..8aa3251dfd 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/RoomEntity.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/RoomEntity.kt
@@ -8,7 +8,8 @@ import io.realm.annotations.PrimaryKey
 import kotlin.properties.Delegates
 
 open class RoomEntity(@PrimaryKey var roomId: String = "",
-                      var chunks: RealmList<ChunkEntity> = RealmList()
+                      var chunks: RealmList<ChunkEntity> = RealmList(),
+                      var areAllMembersLoaded: Boolean = false
 ) : RealmObject() {
 
     private var membershipStr: String = MyMembership.NONE.name
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/query/EventEntityQueries.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/query/EventEntityQueries.kt
index 8abba422d6..b18b67ac25 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/query/EventEntityQueries.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/query/EventEntityQueries.kt
@@ -8,6 +8,11 @@ import io.realm.Realm
 import io.realm.RealmQuery
 import io.realm.Sort
 
+fun EventEntity.Companion.where(realm: Realm, eventId: String): RealmQuery<EventEntity> {
+    return realm.where(EventEntity::class.java)
+            .equalTo("eventId", eventId)
+}
+
 fun EventEntity.Companion.where(realm: Realm, roomId: String, type: String? = null): RealmQuery<EventEntity> {
     val query = realm.where(EventEntity::class.java)
             .equalTo("chunk.room.roomId", roomId)
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/SessionModule.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/SessionModule.kt
index ea2085eb3a..490f9e54ee 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/SessionModule.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/SessionModule.kt
@@ -4,8 +4,8 @@ import com.zhuinden.monarchy.Monarchy
 import im.vector.matrix.android.api.session.room.RoomService
 import im.vector.matrix.android.internal.auth.data.SessionParams
 import im.vector.matrix.android.internal.session.room.DefaultRoomService
-import im.vector.matrix.android.internal.session.room.RoomDisplayNameResolver
-import im.vector.matrix.android.internal.session.room.RoomMemberDisplayNameResolver
+import im.vector.matrix.android.internal.session.room.members.RoomDisplayNameResolver
+import im.vector.matrix.android.internal.session.room.members.RoomMemberDisplayNameResolver
 import im.vector.matrix.android.internal.session.room.RoomSummaryUpdater
 import io.realm.RealmConfiguration
 import org.koin.dsl.context.ModuleDefinition
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/DefaultRoom.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/DefaultRoom.kt
index fb63b721aa..d01eba5f64 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/DefaultRoom.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/DefaultRoom.kt
@@ -4,17 +4,23 @@ import android.arch.lifecycle.LiveData
 import android.arch.paging.LivePagedListBuilder
 import android.arch.paging.PagedList
 import com.zhuinden.monarchy.Monarchy
+import im.vector.matrix.android.api.MatrixCallback
 import im.vector.matrix.android.api.session.events.interceptor.EnrichedEventInterceptor
 import im.vector.matrix.android.api.session.events.model.EnrichedEvent
 import im.vector.matrix.android.api.session.room.Room
+import im.vector.matrix.android.api.session.room.model.Membership
 import im.vector.matrix.android.api.session.room.model.MyMembership
+import im.vector.matrix.android.api.util.Cancelable
 import im.vector.matrix.android.internal.database.mapper.asDomain
 import im.vector.matrix.android.internal.database.model.ChunkEntity
+import im.vector.matrix.android.internal.database.model.RoomEntity
 import im.vector.matrix.android.internal.database.model.RoomSummaryEntity
 import im.vector.matrix.android.internal.database.query.where
 import im.vector.matrix.android.internal.session.events.interceptor.MessageEventInterceptor
+import im.vector.matrix.android.internal.session.room.members.LoadRoomMembersRequest
 import im.vector.matrix.android.internal.session.room.timeline.PaginationRequest
 import im.vector.matrix.android.internal.session.room.timeline.TimelineBoundaryCallback
+import im.vector.matrix.android.internal.session.sync.SyncTokenStore
 import io.realm.Sort
 import org.koin.standalone.KoinComponent
 import org.koin.standalone.inject
@@ -26,7 +32,10 @@ data class DefaultRoom(
 ) : Room, KoinComponent {
 
     private val paginationRequest by inject<PaginationRequest>()
+    private val loadRoomMembersRequest by inject<LoadRoomMembersRequest>()
+    private val syncTokenStore by inject<SyncTokenStore>()
     private val monarchy by inject<Monarchy>()
+
     private val boundaryCallback = TimelineBoundaryCallback(paginationRequest, roomId, monarchy, Executors.newSingleThreadExecutor())
     private val eventInterceptors = ArrayList<EnrichedEventInterceptor>()
 
@@ -71,5 +80,22 @@ data class DefaultRoom(
         return roomSummary?.joinedMembersCount ?: 0
     }
 
+    override fun loadRoomMembersIfNeeded(): Cancelable {
+        return if (areAllMembersLoaded()) {
+            object : Cancelable {}
+        } else {
+            val token = syncTokenStore.getLastToken()
+            loadRoomMembersRequest.execute(roomId, token, Membership.LEAVE, object : MatrixCallback<Boolean> {})
+        }
+    }
+
+
+    private fun areAllMembersLoaded(): Boolean {
+        return monarchy
+                       .fetchAllCopiedSync { RoomEntity.where(it, roomId) }
+                       .firstOrNull()
+                       ?.areAllMembersLoaded ?: false
+    }
+
 
 }
\ No newline at end of file
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomAPI.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomAPI.kt
index cf2e9a61ee..a93e310746 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomAPI.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomAPI.kt
@@ -1,6 +1,7 @@
 package im.vector.matrix.android.internal.session.room
 
 import im.vector.matrix.android.internal.network.NetworkConstants
+import im.vector.matrix.android.internal.session.room.model.RoomMembersResponse
 import im.vector.matrix.android.internal.session.room.model.TokenChunkEvent
 import kotlinx.coroutines.Deferred
 import retrofit2.Response
@@ -28,4 +29,20 @@ interface RoomAPI {
     ): Deferred<Response<TokenChunkEvent>>
 
 
+    /**
+     * Get all members of a room
+     *
+     * @param roomId        the room id where to get the members
+     * @param syncToken     the sync token (optional)
+     * @param membership    to include only one type of membership (optional)
+     * @param notMembership to exclude one type of membership (optional)
+     */
+    @GET(NetworkConstants.URI_API_PREFIX_PATH_R0 + "rooms/{roomId}/members")
+    fun getMembers(@Path("roomId") roomId: String,
+                   @Query("at") syncToken: String?,
+                   @Query("membership") membership: String?,
+                   @Query("not_membership") notMembership: String?
+    ): Deferred<Response<RoomMembersResponse>>
+
+
 }
\ No newline at end of file
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomModule.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomModule.kt
index 45bc843837..0aee01b8d4 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomModule.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomModule.kt
@@ -1,6 +1,7 @@
 package im.vector.matrix.android.internal.session.room
 
 import im.vector.matrix.android.internal.session.DefaultSession
+import im.vector.matrix.android.internal.session.room.members.LoadRoomMembersRequest
 import im.vector.matrix.android.internal.session.room.timeline.PaginationRequest
 import org.koin.dsl.context.ModuleDefinition
 import org.koin.dsl.module.Module
@@ -20,5 +21,10 @@ class RoomModule : Module {
         scope(DefaultSession.SCOPE) {
             PaginationRequest(get(), get(), get(), get())
         }
+
+        scope(DefaultSession.SCOPE) {
+            LoadRoomMembersRequest(get(), get(), get(), get())
+        }
+
     }.invoke()
 }
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomSummaryUpdater.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomSummaryUpdater.kt
index 6c1aff68b7..302d255403 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomSummaryUpdater.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomSummaryUpdater.kt
@@ -12,6 +12,7 @@ import im.vector.matrix.android.internal.database.model.RoomEntity
 import im.vector.matrix.android.internal.database.model.RoomSummaryEntity
 import im.vector.matrix.android.internal.database.query.last
 import im.vector.matrix.android.internal.database.query.where
+import im.vector.matrix.android.internal.session.room.members.RoomDisplayNameResolver
 import io.realm.Realm
 import timber.log.Timber
 import java.util.concurrent.atomic.AtomicBoolean
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/members/LoadRoomMembersRequest.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/members/LoadRoomMembersRequest.kt
new file mode 100644
index 0000000000..ca5613fd20
--- /dev/null
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/members/LoadRoomMembersRequest.kt
@@ -0,0 +1,74 @@
+package im.vector.matrix.android.internal.session.room.members
+
+import arrow.core.Either
+import arrow.core.flatMap
+import arrow.core.leftIfNull
+import com.zhuinden.monarchy.Monarchy
+import im.vector.matrix.android.api.MatrixCallback
+import im.vector.matrix.android.api.failure.Failure
+import im.vector.matrix.android.api.session.room.model.Membership
+import im.vector.matrix.android.api.util.Cancelable
+import im.vector.matrix.android.internal.database.model.EventEntity
+import im.vector.matrix.android.internal.database.model.RoomEntity
+import im.vector.matrix.android.internal.database.query.findAllRoomMembers
+import im.vector.matrix.android.internal.database.query.where
+import im.vector.matrix.android.internal.network.executeRequest
+import im.vector.matrix.android.internal.session.room.RoomAPI
+import im.vector.matrix.android.internal.session.room.model.RoomMembersResponse
+import im.vector.matrix.android.internal.session.sync.StateEventsChunkHandler
+import im.vector.matrix.android.internal.util.CancelableCoroutine
+import im.vector.matrix.android.internal.util.MatrixCoroutineDispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+internal class LoadRoomMembersRequest(private val roomAPI: RoomAPI,
+                                      private val monarchy: Monarchy,
+                                      private val coroutineDispatchers: MatrixCoroutineDispatchers,
+                                      private val stateEventsChunkHandler: StateEventsChunkHandler) {
+
+    fun execute(roomId: String,
+                streamToken: String?,
+                excludeMembership: Membership? = null,
+                callback: MatrixCallback<Boolean>
+    ): Cancelable {
+        val job = GlobalScope.launch(coroutineDispatchers.main) {
+            val responseOrFailure = execute(roomId, streamToken, excludeMembership)
+            responseOrFailure.bimap({ callback.onFailure(it) }, { callback.onSuccess(true) })
+        }
+        return CancelableCoroutine(job)
+    }
+
+    //TODO : manage stream token (we have 404 on some rooms actually)
+    private suspend fun execute(roomId: String,
+                                streamToken: String?,
+                                excludeMembership: Membership?) = withContext(coroutineDispatchers.io) {
+
+        return@withContext executeRequest<RoomMembersResponse> {
+            apiCall = roomAPI.getMembers(roomId, null, null, excludeMembership?.value)
+        }.leftIfNull {
+            Failure.Unknown(RuntimeException("RoomMembersResponse shouldn't be null"))
+        }.flatMap { response ->
+            try {
+                insertInDb(response, roomId)
+                Either.right(response)
+            } catch (exception: Exception) {
+                Either.Left(Failure.Unknown(exception))
+            }
+        }
+    }
+
+    private fun insertInDb(response: RoomMembersResponse, roomId: String) {
+        monarchy.runTransactionSync { realm ->
+            // We ignore all the already known members
+            val roomMembers = EventEntity.findAllRoomMembers(realm, roomId)
+            val eventsToInsert = response.roomMemberEvents.filter { !roomMembers.containsKey(it.stateKey) }
+            stateEventsChunkHandler.handle(realm, roomId, eventsToInsert)
+
+            RoomEntity
+                    .where(realm, roomId).findFirst()
+                    ?.let { it.areAllMembersLoaded = true }
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomDisplayNameResolver.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/members/RoomDisplayNameResolver.kt
similarity index 98%
rename from matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomDisplayNameResolver.kt
rename to matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/members/RoomDisplayNameResolver.kt
index 11ec0f1add..8a1ec1cafe 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomDisplayNameResolver.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/members/RoomDisplayNameResolver.kt
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package im.vector.matrix.android.internal.session.room
+package im.vector.matrix.android.internal.session.room.members
 
 import android.content.Context
 import com.zhuinden.monarchy.Monarchy
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomMemberDisplayNameResolver.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/members/RoomMemberDisplayNameResolver.kt
similarity index 95%
rename from matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomMemberDisplayNameResolver.kt
rename to matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/members/RoomMemberDisplayNameResolver.kt
index 71d7da554d..9da9400cdc 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomMemberDisplayNameResolver.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/members/RoomMemberDisplayNameResolver.kt
@@ -1,4 +1,4 @@
-package im.vector.matrix.android.internal.session.room
+package im.vector.matrix.android.internal.session.room.members
 
 import im.vector.matrix.android.api.session.room.model.RoomMember
 
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/model/RoomMembersResponse.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/model/RoomMembersResponse.kt
new file mode 100644
index 0000000000..6143a35e40
--- /dev/null
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/model/RoomMembersResponse.kt
@@ -0,0 +1,10 @@
+package im.vector.matrix.android.internal.session.room.model
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+import im.vector.matrix.android.api.session.events.model.Event
+
+@JsonClass(generateAdapter = true)
+data class RoomMembersResponse(
+        @Json(name = "chunk") val roomMemberEvents: List<Event>
+)
\ No newline at end of file