Index: lldb/source/Commands/CommandObjectTarget.cpp
===================================================================
--- lldb/source/Commands/CommandObjectTarget.cpp
+++ lldb/source/Commands/CommandObjectTarget.cpp
@@ -1167,6 +1167,24 @@
 
   ~CommandObjectTargetModulesSearchPathsInsert() override = default;
 
+  void
+  HandleArgumentCompletion(CompletionRequest &request,
+                           OptionElementVector &opt_element_vector) override {
+    if (!m_exe_ctx.HasTargetScope() || request.GetCursorIndex())
+      return;
+
+    Target *target = m_exe_ctx.GetTargetPtr();
+    const PathMappingList &list = target->GetImageSearchPathList();
+    const size_t num = list.GetSize();
+    ConstString old_path, new_path;
+    for (size_t i = 0; i < num; ++i)
+      if (list.GetPathsAtIndex(i, old_path, new_path)) {
+        StreamString strm;
+        strm << old_path << " -> " << new_path;
+        request.TryCompleteCurrentArg(std::to_string(i), strm.GetString());
+      }
+  }
+
 protected:
   bool DoExecute(Args &command, CommandReturnObject &result) override {
     Target *target = &GetSelectedTarget();
Index: lldb/test/API/functionalities/completion/TestCompletion.py
===================================================================
--- lldb/test/API/functionalities/completion/TestCompletion.py
+++ lldb/test/API/functionalities/completion/TestCompletion.py
@@ -342,6 +342,18 @@
         self.complete_from_to('target modules load a.ou',
                               ['a.out'])
 
+    def test_target_modules_search_paths_insert(self):
+        # Completion won't work without a valid target.
+        self.complete_from_to("target modules search-paths insert ", "target modules search-paths insert ")
+        self.build()
+        target = self.dbg.CreateTarget(self.getBuildArtifact('a.out'))
+        self.assertTrue(target, VALID_TARGET)
+        self.complete_from_to("target modules search-paths insert ", "target modules search-paths insert ")
+        self.runCmd("target modules search-paths add a b")
+        self.complete_from_to("target modules search-paths insert ", "target modules search-paths insert 0")
+        # Completion only works for the first arg.
+        self.complete_from_to("target modules search-paths insert 0 ", "target modules search-paths insert 0 ")
+
     def test_target_create_dash_co(self):
         """Test that 'target create --co' completes to 'target variable --core '."""
         self.complete_from_to('target create --co', 'target create --core ')