diff --git a/lib/ui/stdcontext.inc b/lib/ui/stdcontext.inc
index 3e490927be..9acf334562 100644
--- a/lib/ui/stdcontext.inc
+++ b/lib/ui/stdcontext.inc
@@ -358,6 +358,7 @@ Menuset
 		Item "Apply Last Text Style|A" "textstyle-apply"
 		Submenu "Text Style|x" "edit_textstyles"
 		Item "Paragraph Settings...|P" "layout-paragraph"
+		OptItem "Unify Graphics Groups|U" "graphics-unify"
 		LanguageSelector
 		Separator
 		Item "Fullscreen Mode" "ui-toggle fullscreen"
diff --git a/src/BufferView.cpp b/src/BufferView.cpp
index 36ac46cdde..edea2eb320 100644
--- a/src/BufferView.cpp
+++ b/src/BufferView.cpp
@@ -1134,6 +1134,10 @@ bool BufferView::getStatus(FuncRequest const & cmd, FuncStatus & flag)
 		flag.setEnabled(true);
 		break;
 
+	case LFUN_GRAPHICS_UNIFY:
+		flag.setEnabled(cur.selection());
+		break;
+
 	case LFUN_WORD_FINDADV: {
 		FindAndReplaceOptions opt;
 		istringstream iss(to_utf8(cmd.argument()));
@@ -1655,6 +1659,47 @@ void BufferView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 		break;
 	}
 
+	case LFUN_GRAPHICS_UNIFY: {
+
+		cur.recordUndoFullBuffer();
+
+		DocIterator from, to;
+		from = cur.selectionBegin();
+		to = cur.selectionEnd();
+
+		string newId = cmd.getArg(0);
+		bool fetchId=newId.empty(); //if we wait for groupId from first graphics inset
+
+		InsetGraphicsParams grp_par;
+		InsetGraphics::string2params(graphics::getGroupParams(buffer_, newId), buffer_, grp_par);
+
+		if (!from.nextInset())	//move to closest inset
+			from.forwardInset();
+
+		while (!from.empty() && from < to) {
+			Inset * inset = from.nextInset();
+			if (!inset)
+				break;
+			if (inset->lyxCode() == GRAPHICS_CODE) {
+				InsetGraphics * ig = inset->asInsetGraphics();
+				if (!ig)
+					break;
+				InsetGraphicsParams inspar = ig->getParams();
+				if (fetchId) {
+				        grp_par = inspar;
+					fetchId = false;
+
+				} else {
+					grp_par.filename = inspar.filename;
+					ig->setParams(grp_par);
+				}
+			}
+			from.forwardInset();
+		}
+		dr.screenUpdate(Update::Force); //needed if triggered from context menu
+		break;
+	}
+
 	case LFUN_STATISTICS: {
 		DocIterator from, to;
 		if (cur.selection()) {
diff --git a/src/FuncCode.h b/src/FuncCode.h
index 4a5983147d..cce61f0df5 100644
--- a/src/FuncCode.h
+++ b/src/FuncCode.h
@@ -476,7 +476,8 @@ enum FuncCode
 	LFUN_DEVEL_MODE_TOGGLE,         // lasgouttes 20170723
 	//370
 	LFUN_EXPORT_CANCEL,             // rgh, 20171227
-	LFUN_BUFFER_ANONYMIZE,             // sanda, 20180201
+	LFUN_BUFFER_ANONYMIZE,          // sanda, 20180201
+	LFUN_GRAPHICS_UNIFY,            // sanda, 20180207
 	LFUN_LASTACTION                 // end of the table
 };
 
diff --git a/src/LyXAction.cpp b/src/LyXAction.cpp
index 33d5100a82..871612ed4a 100644
--- a/src/LyXAction.cpp
+++ b/src/LyXAction.cpp
@@ -3545,6 +3545,17 @@ void LyXAction::init()
  */
 		{ LFUN_SET_GRAPHICS_GROUP, "set-graphics-group", Noop, Edit },
 
+/*!
+ * \var lyx::FuncCode lyx::LFUN_GRAPHICS_UNIFY
+ * \li Action: Set the same group for all graphics insets in the marked block.
+ * \li Syntax: graphics-unify [<GROUP>]
+ * \li Params: <GROUP>: Id for an existing group. In case the Id is an empty string,
+                        the group Id from the first graphics inset will be used.
+ * \li Origin: sanda, 7 Feb 2018
+ * \endvar
+ */
+		{ LFUN_GRAPHICS_UNIFY, "graphics-unify", Noop, Edit },
+
 
 /*!
  * \var lyx::FuncCode lyx::LFUN_SPACE_INSERT