Index: lldb/include/lldb/Interpreter/CommandCompletions.h
===================================================================
--- lldb/include/lldb/Interpreter/CommandCompletions.h
+++ lldb/include/lldb/Interpreter/CommandCompletions.h
@@ -41,10 +41,11 @@
     eProcessIDCompletion = (1u << 13),
     eFrameIndexCompletion = (1u << 14),
     eThreadIndexCompletion = (1u << 15),
+    eWatchPointIDCompletion = (1u << 16),
     // This item serves two purposes.  It is the last element in the enum, so
     // you can add custom enums starting from here in your Option class. Also
     // if you & in this bit the base code will not process the option.
-    eCustomCompletion = (1u << 16)
+    eCustomCompletion = (1u << 17)
   };
 
   static bool InvokeCommonCompletionCallbacks(
@@ -111,6 +112,9 @@
 
   static void ThreadIndexes(CommandInterpreter &interpreter,
                             CompletionRequest &request, SearchFilter *searcher);
+
+  static void WatchPointIDs(CommandInterpreter &interpreter,
+                            CompletionRequest &request, SearchFilter *searcher);
 };
 
 } // namespace lldb_private
Index: lldb/source/Commands/CommandCompletions.cpp
===================================================================
--- lldb/source/Commands/CommandCompletions.cpp
+++ lldb/source/Commands/CommandCompletions.cpp
@@ -9,6 +9,7 @@
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringSet.h"
 
+#include "lldb/Breakpoint/Watchpoint.h"
 #include "lldb/Core/FileSpecList.h"
 #include "lldb/Core/Module.h"
 #include "lldb/Core/PluginManager.h"
@@ -65,6 +66,7 @@
       {eProcessIDCompletion, CommandCompletions::ProcessIDs},
       {eFrameIndexCompletion, CommandCompletions::FrameIndexes},
       {eThreadIndexCompletion, CommandCompletions::ThreadIndexes},
+      {eWatchPointIDCompletion, CommandCompletions::WatchPointIDs},
       {eNoCompletion, nullptr} // This one has to be last in the list.
   };
 
@@ -669,3 +671,21 @@
                                   strm.GetString());
   }
 }
+
+void CommandCompletions::WatchPointIDs(CommandInterpreter &interpreter,
+                                       CompletionRequest &request,
+                                       SearchFilter *searcher) {
+  const ExecutionContext &exe_ctx = interpreter.GetExecutionContext();
+  if (!exe_ctx.HasTargetScope())
+    return;
+
+  const WatchpointList &wp_list = exe_ctx.GetTargetPtr()->GetWatchpointList();
+  const size_t wp_num = wp_list.GetSize();
+  for (size_t idx = 0; idx < wp_num; ++idx) {
+    const lldb::WatchpointSP wp_sp = wp_list.GetByIndex(idx);
+    StreamString strm;
+    wp_sp->Dump(&strm);
+    request.TryCompleteCurrentArg(std::to_string(wp_sp->GetID()),
+                                  strm.GetString());
+  }
+}
Index: lldb/source/Commands/CommandObjectWatchpoint.cpp
===================================================================
--- lldb/source/Commands/CommandObjectWatchpoint.cpp
+++ lldb/source/Commands/CommandObjectWatchpoint.cpp
@@ -292,6 +292,14 @@
 
   ~CommandObjectWatchpointEnable() override = default;
 
+  void
+  HandleArgumentCompletion(CompletionRequest &request,
+                           OptionElementVector &opt_element_vector) override {
+    CommandCompletions::InvokeCommonCompletionCallbacks(
+        GetCommandInterpreter(), CommandCompletions::eWatchPointIDCompletion,
+        request, nullptr);
+  }
+
 protected:
   bool DoExecute(Args &command, CommandReturnObject &result) override {
     Target *target = &GetSelectedTarget();
@@ -362,6 +370,14 @@
 
   ~CommandObjectWatchpointDisable() override = default;
 
+  void
+  HandleArgumentCompletion(CompletionRequest &request,
+                           OptionElementVector &opt_element_vector) override {
+    CommandCompletions::InvokeCommonCompletionCallbacks(
+        GetCommandInterpreter(), CommandCompletions::eWatchPointIDCompletion,
+        request, nullptr);
+  }
+
 protected:
   bool DoExecute(Args &command, CommandReturnObject &result) override {
     Target *target = &GetSelectedTarget();
@@ -439,6 +455,14 @@
 
   ~CommandObjectWatchpointDelete() override = default;
 
+  void
+  HandleArgumentCompletion(CompletionRequest &request,
+                           OptionElementVector &opt_element_vector) override {
+    CommandCompletions::InvokeCommonCompletionCallbacks(
+        GetCommandInterpreter(), CommandCompletions::eWatchPointIDCompletion,
+        request, nullptr);
+  }
+
   Options *GetOptions() override { return &m_options; }
 
   class CommandOptions : public Options {
@@ -557,6 +581,14 @@
 
   ~CommandObjectWatchpointIgnore() override = default;
 
+  void
+  HandleArgumentCompletion(CompletionRequest &request,
+                           OptionElementVector &opt_element_vector) override {
+    CommandCompletions::InvokeCommonCompletionCallbacks(
+        GetCommandInterpreter(), CommandCompletions::eWatchPointIDCompletion,
+        request, nullptr);
+  }
+
   Options *GetOptions() override { return &m_options; }
 
   class CommandOptions : public Options {
@@ -677,6 +709,14 @@
 
   ~CommandObjectWatchpointModify() override = default;
 
+  void
+  HandleArgumentCompletion(CompletionRequest &request,
+                           OptionElementVector &opt_element_vector) override {
+    CommandCompletions::InvokeCommonCompletionCallbacks(
+        GetCommandInterpreter(), CommandCompletions::eWatchPointIDCompletion,
+        request, nullptr);
+  }
+
   Options *GetOptions() override { return &m_options; }
 
   class CommandOptions : public Options {
Index: lldb/test/API/functionalities/completion/TestCompletion.py
===================================================================
--- lldb/test/API/functionalities/completion/TestCompletion.py
+++ lldb/test/API/functionalities/completion/TestCompletion.py
@@ -232,6 +232,22 @@
         """Test that 'help watchpoint s' completes to 'help watchpoint set '."""
         self.complete_from_to('help watchpoint s', 'help watchpoint set ')
 
+    def test_common_complete_watchpoint_ids(self):
+        subcommands = ['enable', 'disable', 'delete', 'modify', 'ignore']
+
+        # Completion should not work without a target.
+        for subcommand in subcommands:
+            self.complete_from_to('watchpoint ' + subcommand + ' ',
+                                  'watchpoint ' + subcommand + ' ')
+
+        # Create a process to provide a target and enable watchpoint setting.
+        self.build()
+        lldbutil.run_to_source_breakpoint(self, '// Break here', lldb.SBFileSpec("main.cpp"))
+
+        self.runCmd('watchpoint set variable ptr_fooo')
+        for subcommand in subcommands:
+            self.complete_from_to('watchpoint ' + subcommand + ' ', ['1'])
+
     def test_settings_append_target_er(self):
         """Test that 'settings append target.er' completes to 'settings append target.error-path'."""
         self.complete_from_to(