diff --git a/changelog.d/2159.feature b/changelog.d/2159.feature
new file mode 100644
index 00000000000..5adbf5595ff
--- /dev/null
+++ b/changelog.d/2159.feature
@@ -0,0 +1 @@
+Added support for MSC4027 (render custom images in reactions)
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/MessagesReactionButton.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/MessagesReactionButton.kt
index d80bde4cf41..7720295d1d3 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/MessagesReactionButton.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/MessagesReactionButton.kt
@@ -24,7 +24,9 @@ import androidx.compose.foundation.border
 import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
@@ -41,6 +43,8 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import coil.compose.AsyncImage
+import io.element.android.compound.theme.ElementTheme
 import io.element.android.features.messages.impl.R
 import io.element.android.features.messages.impl.timeline.model.AggregatedReaction
 import io.element.android.features.messages.impl.timeline.model.AggregatedReactionProvider
@@ -52,7 +56,8 @@ import io.element.android.libraries.designsystem.theme.components.Icon
 import io.element.android.libraries.designsystem.theme.components.Surface
 import io.element.android.libraries.designsystem.theme.components.Text
 import io.element.android.libraries.designsystem.utils.CommonDrawables
-import io.element.android.compound.theme.ElementTheme
+import io.element.android.libraries.matrix.api.media.MediaSource
+import io.element.android.libraries.matrix.ui.media.MediaRequestData
 
 @Composable
 @OptIn(ExperimentalFoundationApi::class)
@@ -114,8 +119,9 @@ sealed interface MessagesReactionsButtonContent {
     val isHighlighted get() = this is Reaction && reaction.isHighlighted
 }
 
-private val reactionEmojiLineHeight = 20.sp
-private val addEmojiSize = 16.dp
+internal val REACTION_EMOJI_LINE_HEIGHT = 20.sp
+internal const val REACTION_IMAGE_ASPECT_RATIO = 1.0f
+private val ADD_EMOJI_SIZE = 16.dp
 
 @Composable
 private fun TextContent(
@@ -123,7 +129,7 @@ private fun TextContent(
     modifier: Modifier = Modifier,
 ) = Text(
     modifier = modifier
-        .height(reactionEmojiLineHeight.toDp()),
+        .height(REACTION_EMOJI_LINE_HEIGHT.toDp()),
     text = text,
     style = ElementTheme.typography.fontBodyMdRegular,
     color = ElementTheme.materialColors.primary
@@ -138,7 +144,7 @@ private fun IconContent(
     contentDescription = stringResource(id = R.string.screen_room_timeline_add_reaction),
     tint = ElementTheme.materialColors.secondary,
     modifier = modifier
-        .size(addEmojiSize)
+        .size(ADD_EMOJI_SIZE)
 
 )
 
@@ -150,13 +156,25 @@ private fun ReactionContent(
     verticalAlignment = Alignment.CenterVertically,
     modifier = modifier,
 ) {
-    Text(
-        text = reaction.displayKey,
-        style = ElementTheme.typography.fontBodyMdRegular.copy(
-            fontSize = 15.sp,
-            lineHeight = reactionEmojiLineHeight,
-        ),
-    )
+    // Check if this is a custom reaction (MSC4027)
+    if (reaction.key.startsWith("mxc://")) {
+        AsyncImage(
+            modifier = modifier
+                .heightIn(min = REACTION_EMOJI_LINE_HEIGHT.toDp(), max = REACTION_EMOJI_LINE_HEIGHT.toDp())
+                .aspectRatio(REACTION_IMAGE_ASPECT_RATIO, false),
+            model = MediaRequestData(MediaSource(reaction.key), MediaRequestData.Kind.Content),
+            contentDescription = null
+        )
+    }
+    else {
+        Text(
+            text = reaction.displayKey,
+            style = ElementTheme.typography.fontBodyMdRegular.copy(
+                fontSize = 15.sp,
+                lineHeight = REACTION_EMOJI_LINE_HEIGHT,
+            ),
+        )
+    }
     if (reaction.count > 1) {
         Spacer(modifier = Modifier.width(4.dp))
         Text(
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/reactionsummary/ReactionSummaryView.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/reactionsummary/ReactionSummaryView.kt
index 3e6568d8807..24f6a52d0ae 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/reactionsummary/ReactionSummaryView.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/reactionsummary/ReactionSummaryView.kt
@@ -24,6 +24,7 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.heightIn
@@ -57,20 +58,27 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import coil.compose.AsyncImage
+import io.element.android.compound.theme.ElementTheme
+import io.element.android.features.messages.impl.timeline.components.REACTION_IMAGE_ASPECT_RATIO
 import io.element.android.features.messages.impl.timeline.model.AggregatedReaction
 import io.element.android.libraries.designsystem.components.avatar.Avatar
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
-import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.preview.ElementPreview
+import io.element.android.libraries.designsystem.preview.PreviewsDayNight
+import io.element.android.libraries.designsystem.text.toDp
 import io.element.android.libraries.designsystem.theme.components.ModalBottomSheet
 import io.element.android.libraries.designsystem.theme.components.Surface
 import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.user.MatrixUser
+import io.element.android.libraries.matrix.ui.media.MediaRequestData
 import io.element.android.libraries.matrix.ui.model.getAvatarData
-import io.element.android.compound.theme.ElementTheme
 import kotlinx.coroutines.launch
 
+internal val REACTION_SUMMARY_LINE_HEIGHT = 25.sp
+
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun ReactionSummaryView(
@@ -192,13 +200,25 @@ private fun AggregatedReactionButton(
             verticalAlignment = Alignment.CenterVertically,
             modifier = Modifier,
         ) {
-            Text(
-                text = reaction.displayKey,
-                style = ElementTheme.typography.fontBodyMdRegular.copy(
-                    fontSize = 20.sp,
-                    lineHeight = 25.sp
-                ),
-            )
+            // Check if this is a custom reaction (MSC4027)
+            if (reaction.key.startsWith("mxc://")) {
+                AsyncImage(
+                    modifier = Modifier
+                        .heightIn(min = REACTION_SUMMARY_LINE_HEIGHT.toDp(), max = REACTION_SUMMARY_LINE_HEIGHT.toDp())
+                        .aspectRatio(REACTION_IMAGE_ASPECT_RATIO, false),
+                    model = MediaRequestData(MediaSource(reaction.key), MediaRequestData.Kind.Content),
+                    contentDescription = null
+                )
+            }
+            else {
+                Text(
+                    text = reaction.displayKey,
+                    style = ElementTheme.typography.fontBodyMdRegular.copy(
+                        fontSize = 20.sp,
+                        lineHeight = REACTION_SUMMARY_LINE_HEIGHT
+                    ),
+                )
+            }
             if (reaction.count > 1) {
                 Spacer(modifier = Modifier.width(4.dp))
                 Text(
@@ -206,7 +226,7 @@ private fun AggregatedReactionButton(
                     color = textColor,
                     style = ElementTheme.typography.fontBodyMdRegular.copy(
                         fontSize = 20.sp,
-                        lineHeight = 25.sp
+                        lineHeight = REACTION_SUMMARY_LINE_HEIGHT
                     )
                 )
             }