diff --git a/scripts/startup/bl_ui/properties_material_gpencil.py b/scripts/startup/bl_ui/properties_material_gpencil.py
index 64bfcb6836f..4c17caead80 100644
--- a/scripts/startup/bl_ui/properties_material_gpencil.py
+++ b/scripts/startup/bl_ui/properties_material_gpencil.py
@@ -15,33 +15,36 @@ from bl_ui.properties_grease_pencil_common import (
 class GPENCIL_MT_material_context_menu(Menu):
     bl_label = "Material Specials"
 
-    def draw(self, _context):
+    def draw(self, context):
         layout = self.layout
+        if context.preferences.experimental.use_grease_pencil_version3:
+            layout.operator("grease_pencil.material_reveal", icon='RESTRICT_VIEW_OFF', text="Show All")
+        else:
+            layout.operator("gpencil.material_reveal", icon='RESTRICT_VIEW_OFF', text="Show All")
+            layout.operator("gpencil.material_hide", icon='RESTRICT_VIEW_ON', text="Hide Others").unselected = True
 
-        layout.operator("gpencil.material_reveal", icon='RESTRICT_VIEW_OFF', text="Show All")
-        layout.operator("gpencil.material_hide", icon='RESTRICT_VIEW_ON', text="Hide Others").unselected = True
+            layout.separator()
 
-        layout.separator()
+            layout.operator("gpencil.material_lock_all", icon='LOCKED', text="Lock All")
+            layout.operator("gpencil.material_unlock_all", icon='UNLOCKED', text="Unlock All")
 
-        layout.operator("gpencil.material_lock_all", icon='LOCKED', text="Lock All")
-        layout.operator("gpencil.material_unlock_all", icon='UNLOCKED', text="Unlock All")
+            layout.operator("gpencil.material_lock_unused", text="Lock Unselected")
+            layout.operator("gpencil.lock_layer", text="Lock Unused")
 
-        layout.operator("gpencil.material_lock_unused", text="Lock Unselected")
-        layout.operator("gpencil.lock_layer", text="Lock Unused")
+            layout.separator()
 
-        layout.separator()
+            layout.operator("gpencil.material_to_vertex_color", text="Convert Materials to Color Attribute")
+            layout.operator("gpencil.extract_palette_vertex", text="Extract Palette from Color Attribute")
 
-        layout.operator("gpencil.material_to_vertex_color", text="Convert Materials to Color Attribute")
-        layout.operator("gpencil.extract_palette_vertex", text="Extract Palette from Color Attribute")
+            layout.separator()
 
-        layout.separator()
+            layout.operator("gpencil.materials_copy_to_object", text="Copy Material to Selected").only_active = True
+            layout.operator("gpencil.materials_copy_to_object", text="Copy All Materials to Selected").only_active = False
 
-        layout.operator("gpencil.materials_copy_to_object", text="Copy Material to Selected").only_active = True
-        layout.operator("gpencil.materials_copy_to_object", text="Copy All Materials to Selected").only_active = False
+            layout.separator()
 
-        layout.separator()
+            layout.operator("gpencil.stroke_merge_material", text="Merge Similar")
 
-        layout.operator("gpencil.stroke_merge_material", text="Merge Similar")
         layout.operator("object.material_slot_remove_unused")
 
 
diff --git a/source/blender/editors/grease_pencil/CMakeLists.txt b/source/blender/editors/grease_pencil/CMakeLists.txt
index 0b21eafd02b..449004ae11d 100644
--- a/source/blender/editors/grease_pencil/CMakeLists.txt
+++ b/source/blender/editors/grease_pencil/CMakeLists.txt
@@ -26,6 +26,7 @@ set(SRC
   intern/grease_pencil_frames.cc
   intern/grease_pencil_geom.cc
   intern/grease_pencil_layers.cc
+  intern/grease_pencil_material.cc
   intern/grease_pencil_ops.cc
   intern/grease_pencil_select.cc
   intern/grease_pencil_utils.cc
diff --git a/source/blender/editors/grease_pencil/intern/grease_pencil_material.cc b/source/blender/editors/grease_pencil/intern/grease_pencil_material.cc
new file mode 100644
index 00000000000..c08ee0d4443
--- /dev/null
+++ b/source/blender/editors/grease_pencil/intern/grease_pencil_material.cc
@@ -0,0 +1,72 @@
+/* SPDX-FileCopyrightText: 2023 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup edgreasepencil
+ */
+
+#include "DNA_material_types.h"
+
+#include "BKE_context.hh"
+#include "BKE_grease_pencil.hh"
+#include "BKE_material.h"
+
+#include "DEG_depsgraph.hh"
+
+#include "ED_grease_pencil.hh"
+
+#include "WM_api.hh"
+
+namespace blender::ed::greasepencil {
+
+/* -------------------------------------------------------------------- */
+/** \name Show All Materials Operator
+ * \{ */
+
+static int grease_pencil_material_reveal_exec(bContext *C, wmOperator * /*op*/)
+{
+  Object *object = CTX_data_active_object(C);
+  GreasePencil &grease_pencil = *static_cast<GreasePencil *>(object->data);
+
+  bool changed = false;
+  for (const int i : IndexRange(object->totcol)) {
+    if (Material *ma = BKE_gpencil_material(object, i + 1)) {
+      MaterialGPencilStyle *gp_style = ma->gp_style;
+      gp_style->flag &= ~GP_MATERIAL_HIDE;
+      DEG_id_tag_update(&ma->id, ID_RECALC_COPY_ON_WRITE);
+      changed = true;
+    }
+  }
+
+  if (changed) {
+    DEG_id_tag_update(&grease_pencil.id, ID_RECALC_GEOMETRY);
+    WM_event_add_notifier(C, NC_GEOM | ND_DATA | NA_EDITED, &grease_pencil);
+  }
+
+  return OPERATOR_FINISHED;
+}
+
+static void GREASE_PENCIL_OT_material_reveal(wmOperatorType *ot)
+{
+  /* Identifiers. */
+  ot->name = "Show All Materials";
+  ot->idname = "GREASE_PENCIL_OT_material_reveal";
+  ot->description = "Unhide all hidden Grease Pencil materials";
+
+  /* Callbacks. */
+  ot->exec = grease_pencil_material_reveal_exec;
+  ot->poll = active_grease_pencil_poll;
+
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/** \} */
+
+}  // namespace blender::ed::greasepencil
+
+void ED_operatortypes_grease_pencil_material()
+{
+  using namespace blender::ed::greasepencil;
+  WM_operatortype_append(GREASE_PENCIL_OT_material_reveal);
+}
diff --git a/source/blender/editors/grease_pencil/intern/grease_pencil_ops.cc b/source/blender/editors/grease_pencil/intern/grease_pencil_ops.cc
index 2f69bd8b064..698d004c02e 100644
--- a/source/blender/editors/grease_pencil/intern/grease_pencil_ops.cc
+++ b/source/blender/editors/grease_pencil/intern/grease_pencil_ops.cc
@@ -15,4 +15,5 @@ void ED_operatortypes_grease_pencil()
   ED_operatortypes_grease_pencil_layers();
   ED_operatortypes_grease_pencil_select();
   ED_operatortypes_grease_pencil_edit();
+  ED_operatortypes_grease_pencil_material();
 }
diff --git a/source/blender/editors/include/ED_grease_pencil.hh b/source/blender/editors/include/ED_grease_pencil.hh
index 7430fc9662e..f00b4830549 100644
--- a/source/blender/editors/include/ED_grease_pencil.hh
+++ b/source/blender/editors/include/ED_grease_pencil.hh
@@ -39,6 +39,7 @@ void ED_operatortypes_grease_pencil_frames();
 void ED_operatortypes_grease_pencil_layers();
 void ED_operatortypes_grease_pencil_select();
 void ED_operatortypes_grease_pencil_edit();
+void ED_operatortypes_grease_pencil_material();
 void ED_keymap_grease_pencil(wmKeyConfig *keyconf);
 /**
  * Get the selection mode for Grease Pencil selection operators: point, stroke, segment.
diff --git a/source/blender/makesrna/intern/rna_material.cc b/source/blender/makesrna/intern/rna_material.cc
index 3cb57bd17ad..91525b77648 100644
--- a/source/blender/makesrna/intern/rna_material.cc
+++ b/source/blender/makesrna/intern/rna_material.cc
@@ -68,6 +68,7 @@ const EnumPropertyItem rna_enum_ramp_blend_items[] = {
 #  include "BKE_colorband.h"
 #  include "BKE_context.hh"
 #  include "BKE_gpencil_legacy.h"
+#  include "BKE_grease_pencil.hh"
 #  include "BKE_main.h"
 #  include "BKE_material.h"
 #  include "BKE_node.h"
@@ -112,6 +113,10 @@ static void rna_MaterialGpencil_update(Main *bmain, Scene *scene, PointerRNA *pt
       bGPdata *gpd = (bGPdata *)ob->data;
       DEG_id_tag_update(&gpd->id, ID_RECALC_GEOMETRY);
     }
+    if (ob->type == OB_GREASE_PENCIL) {
+      GreasePencil &grease_pencil = *static_cast<GreasePencil *>(ob->data);
+      DEG_id_tag_update(&grease_pencil.id, ID_RECALC_GEOMETRY);
+    }
   }
 
   WM_main_add_notifier(NC_GPENCIL | ND_DATA, ma);