diff --git a/src/grp_query_interface.hh b/src/grp_query_interface.hh
new file mode 100644
index 0000000..200f3d9
--- /dev/null
+++ b/src/grp_query_interface.hh
@@ -0,0 +1,29 @@
+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
+
+#ifndef LIBPEPADAPTER_GRP_QUERY_INTERFACE_HH
+#define LIBPEPADAPTER_GRP_QUERY_INTERFACE_HH
+
+#include <pEp/message_api.h>
+#include <pEp/group.h>
+
+namespace pEp {
+    class GroupQueryInterface {
+    public:
+        virtual PEP_STATUS group_query_groups(PEP_SESSION session, identity_list **groups) = 0;
+
+        virtual PEP_STATUS group_query_manager(
+            PEP_SESSION session,
+            const pEp_identity *const group,
+            pEp_identity **manager) = 0;
+
+        virtual PEP_STATUS group_query_members(
+            PEP_SESSION session,
+            const pEp_identity *const group,
+            identity_list **members) = 0;
+
+    private:
+    };
+} // namespace pEp
+
+#endif // LIBPEPADAPTER_GRP_QUERY_INTERFACE_HH