diff --git a/clang/docs/ClangFormatStyleOptions.rst b/clang/docs/ClangFormatStyleOptions.rst
--- a/clang/docs/ClangFormatStyleOptions.rst
+++ b/clang/docs/ClangFormatStyleOptions.rst
@@ -4714,6 +4714,16 @@
      true:                                  false:
      template <int> void foo();     vs.     template<int> void foo();
 
+.. _SpaceAfterOperatorKeyword:
+
+**SpaceAfterOperatorKeyword** (``Boolean``) :versionbadge:`clang-format 17` :ref:`¶ <SpaceAfterOperatorKeyword>`
+  If ``true``, a space will be inserted after the 'operator' keyword.
+
+  .. code-block:: c++
+
+     true:                                  false:
+     bool operator ==(...);         vs.     bool operator==(...);
+
 .. _SpaceAroundPointerQualifiers:
 
 **SpaceAroundPointerQualifiers** (``SpaceAroundPointerQualifiersStyle``) :versionbadge:`clang-format 12` :ref:`¶ <SpaceAroundPointerQualifiers>`
diff --git a/clang/include/clang/Format/Format.h b/clang/include/clang/Format/Format.h
--- a/clang/include/clang/Format/Format.h
+++ b/clang/include/clang/Format/Format.h
@@ -3700,6 +3700,14 @@
   /// \version 4
   bool SpaceAfterTemplateKeyword;
 
+  /// If \c true, a space will be inserted after the 'operator' keyword.
+  /// \code
+  ///    true:                                  false:
+  ///    bool operator ==(...);         vs.     bool operator==(...);
+  /// \endcode
+  /// \version 17
+  bool SpaceAfterOperatorKeyword;
+
   /// Different ways to put a space before opening parentheses.
   enum SpaceAroundPointerQualifiersStyle : int8_t {
     /// Don't ensure spaces around pointer qualifiers and use PointerAlignment
@@ -4412,6 +4420,7 @@
            SpaceAfterCStyleCast == R.SpaceAfterCStyleCast &&
            SpaceAfterLogicalNot == R.SpaceAfterLogicalNot &&
            SpaceAfterTemplateKeyword == R.SpaceAfterTemplateKeyword &&
+           SpaceAfterOperatorKeyword == R.SpaceAfterOperatorKeyword &&
            SpaceBeforeAssignmentOperators == R.SpaceBeforeAssignmentOperators &&
            SpaceBeforeCaseColon == R.SpaceBeforeCaseColon &&
            SpaceBeforeCpp11BracedList == R.SpaceBeforeCpp11BracedList &&
diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -1002,6 +1002,8 @@
     IO.mapOptional("SpaceAfterLogicalNot", Style.SpaceAfterLogicalNot);
     IO.mapOptional("SpaceAfterTemplateKeyword",
                    Style.SpaceAfterTemplateKeyword);
+    IO.mapOptional("SpaceAfterOperatorKeyword",
+                   Style.SpaceAfterOperatorKeyword);
     IO.mapOptional("SpaceAroundPointerQualifiers",
                    Style.SpaceAroundPointerQualifiers);
     IO.mapOptional("SpaceBeforeAssignmentOperators",
@@ -1440,6 +1442,7 @@
   LLVMStyle.SpaceAfterCStyleCast = false;
   LLVMStyle.SpaceAfterLogicalNot = false;
   LLVMStyle.SpaceAfterTemplateKeyword = true;
+  LLVMStyle.SpaceAfterOperatorKeyword = false;
   LLVMStyle.SpaceAroundPointerQualifiers = FormatStyle::SAPQ_Default;
   LLVMStyle.SpaceBeforeCaseColon = false;
   LLVMStyle.SpaceBeforeCtorInitializerColon = true;
@@ -1731,6 +1734,7 @@
   MozillaStyle.PenaltyReturnTypeOnItsOwnLine = 200;
   MozillaStyle.PointerAlignment = FormatStyle::PAS_Left;
   MozillaStyle.SpaceAfterTemplateKeyword = false;
+  MozillaStyle.SpaceAfterOperatorKeyword = false;
   return MozillaStyle;
 }
 
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -3759,6 +3759,7 @@
       Left.Previous->is(tok::kw_operator)) {
     return false;
   }
+
   // co_await (x), co_yield (x), co_return (x)
   if (Left.isOneOf(tok::kw_co_await, tok::kw_co_yield, tok::kw_co_return) &&
       !Right.isOneOf(tok::semi, tok::r_paren)) {
@@ -4202,7 +4203,7 @@
       return true;
 
     if (Left.is(tok::kw_operator))
-      return Right.is(tok::coloncolon);
+      return Style.SpaceAfterOperatorKeyword || Right.is(tok::coloncolon);
     if (Right.is(tok::l_brace) && Right.is(BK_BracedInit) &&
         !Left.opensScope() && Style.SpaceBeforeCpp11BracedList) {
       return true;
diff --git a/clang/unittests/Format/ConfigParseTest.cpp b/clang/unittests/Format/ConfigParseTest.cpp
--- a/clang/unittests/Format/ConfigParseTest.cpp
+++ b/clang/unittests/Format/ConfigParseTest.cpp
@@ -184,6 +184,7 @@
   CHECK_PARSE_BOOL(SpacesInCStyleCastParentheses);
   CHECK_PARSE_BOOL(SpaceAfterCStyleCast);
   CHECK_PARSE_BOOL(SpaceAfterTemplateKeyword);
+  CHECK_PARSE_BOOL(SpaceAfterOperatorKeyword);
   CHECK_PARSE_BOOL(SpaceAfterLogicalNot);
   CHECK_PARSE_BOOL(SpaceBeforeAssignmentOperators);
   CHECK_PARSE_BOOL(SpaceBeforeCaseColon);
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -22905,6 +22905,16 @@
   FormatStyle Style = getLLVMStyle();
   Style.SpaceAfterTemplateKeyword = false;
   verifyFormat("template<int> void foo();", Style);
+  Style.SpaceAfterTemplateKeyword = true;
+  verifyFormat("template <int> void foo();", Style);
+}
+
+TEST_F(FormatTest, SpaceAfterOperatorKeyword) {
+  FormatStyle Style = getLLVMStyle();
+  Style.SpaceAfterOperatorKeyword = false;
+  verifyFormat("bool operator==();", Style);
+  Style.SpaceAfterOperatorKeyword = true;
+  verifyFormat("bool operator ==();", Style);
 }
 
 TEST_F(FormatTest, TripleAngleBrackets) {