diff --git a/src/components/gui/gui.jsx b/src/components/gui/gui.jsx
index 8d251bd14e17538e5f38da679d8ddd3eb752757d..c3b7cff716b6b07fd874c64abfa68035a593fca5 100644
--- a/src/components/gui/gui.jsx
+++ b/src/components/gui/gui.jsx
@@ -65,6 +65,7 @@ const GUIComponent = props => {
         importInfoVisible,
         intl,
         isPlayerOnly,
+        isRtl,
         loading,
         onExtensionButtonClick,
         onActivateCostumesTab,
@@ -110,6 +111,7 @@ const GUIComponent = props => {
         ) : (
             <Box
                 className={styles.pageWrapper}
+                dir={isRtl ? 'rtl' : 'ltr'}
                 {...componentProps}
             >
                 {previewInfoVisible ? (
@@ -282,6 +284,7 @@ GUIComponent.propTypes = {
     importInfoVisible: PropTypes.bool,
     intl: intlShape.isRequired,
     isPlayerOnly: PropTypes.bool,
+    isRtl: PropTypes.bool,
     loading: PropTypes.bool,
     onActivateCostumesTab: PropTypes.func,
     onActivateSoundsTab: PropTypes.func,
diff --git a/src/containers/blocks.jsx b/src/containers/blocks.jsx
index 3862fa653fbe239a2db9d6e29175bcca64f508b4..44d52664e366582e7fa6776e103c9a1993af3ba2 100644
--- a/src/containers/blocks.jsx
+++ b/src/containers/blocks.jsx
@@ -77,7 +77,7 @@ class Blocks extends React.Component {
         const workspaceConfig = defaultsDeep({},
             Blocks.defaultOptions,
             this.props.options,
-            {toolbox: this.props.toolboxXML}
+            {rtl: this.props.isRtl, toolbox: this.props.toolboxXML}
         );
         this.workspace = this.ScratchBlocks.inject(this.blocks, workspaceConfig);
 
@@ -403,6 +403,7 @@ class Blocks extends React.Component {
             options,
             stageSize,
             vm,
+            isRtl,
             isVisible,
             onActivateColorPicker,
             updateToolboxState,
@@ -467,6 +468,7 @@ Blocks.propTypes = {
     anyModalVisible: PropTypes.bool,
     customProceduresVisible: PropTypes.bool,
     extensionLibraryVisible: PropTypes.bool,
+    isRtl: PropTypes.bool,
     isVisible: PropTypes.bool,
     locale: PropTypes.string,
     messages: PropTypes.objectOf(PropTypes.string),
@@ -541,6 +543,7 @@ const mapStateToProps = state => ({
         state.scratchGui.mode.isFullScreen
     ),
     extensionLibraryVisible: state.scratchGui.modals.extensionLibrary,
+    isRtl: state.locales.isRtl,
     locale: state.locales.locale,
     messages: state.locales.messages,
     toolboxXML: state.scratchGui.toolbox.toolboxXML,
diff --git a/src/containers/gui.jsx b/src/containers/gui.jsx
index 8db598c85fd28f2f1c6e66fdbae55468399123c4..ffa099496fc5c3d10587fdb66f3f547e6622f127 100644
--- a/src/containers/gui.jsx
+++ b/src/containers/gui.jsx
@@ -113,6 +113,7 @@ const mapStateToProps = state => ({
     costumesTabVisible: state.scratchGui.editorTab.activeTabIndex === COSTUMES_TAB_INDEX,
     importInfoVisible: state.scratchGui.modals.importInfo,
     isPlayerOnly: state.scratchGui.mode.isPlayerOnly,
+    isRtl: state.locales.isRtl,
     loadingStateVisible: state.scratchGui.modals.loadingProject,
     previewInfoVisible: state.scratchGui.modals.previewInfo,
     targetIsStage: (
diff --git a/src/reducers/locales.js b/src/reducers/locales.js
index fda8f9dc36d14dac09f72fad62f704617b87e0cf..c2c072391ff70d94ea74eaab8685bd048b57e585 100644
--- a/src/reducers/locales.js
+++ b/src/reducers/locales.js
@@ -9,22 +9,28 @@ const UPDATE_LOCALES = 'scratch-gui/locales/UPDATE_LOCALES';
 const SELECT_LOCALE = 'scratch-gui/locales/SELECT_LOCALE';
 
 const initialState = {
+    isRtl: false,
     locale: 'en',
     messagesByLocale: editorMessages,
     messages: editorMessages.en
 };
 
+// TODO: this probably should be coming from scratch-l10n
+const RtlLangs = ['he'];
+
 const reducer = function (state, action) {
     if (typeof state === 'undefined') state = initialState;
     switch (action.type) {
     case SELECT_LOCALE:
         return Object.assign({}, state, {
+            isRtl: RtlLangs.indexOf(action.locale) !== -1,
             locale: action.locale,
             messagesByLocale: state.messagesByLocale,
             messages: state.messagesByLocale[action.locale]
         });
     case UPDATE_LOCALES:
         return Object.assign({}, state, {
+            isRtl: state.isRtl,
             locale: state.locale,
             messagesByLocale: action.messagesByLocale,
             messages: action.messagesByLocale[state.locale]
@@ -53,6 +59,7 @@ const initLocale = function (currentState, locale) {
             {},
             currentState,
             {
+                isRtl: RtlLangs.indexOf(locale) !== -1,
                 locale: locale,
                 messagesByLocale: currentState.messagesByLocale,
                 messages: currentState.messagesByLocale[locale]