diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 26a9baa639..4e4a7b4658 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -776,6 +776,7 @@ cpp_no_cpp11		don't highlight C++11 standard items
 cpp_no_cpp14		don't highlight C++14 standard items
 cpp_no_cpp17		don't highlight C++17 standard items
 cpp_no_cpp20		don't highlight C++20 standard items
+cpp_no_cpp23		don't highlight C++23 standard items
 
 
 CSH							*ft-csh-syntax*
diff --git a/runtime/syntax/cpp.vim b/runtime/syntax/cpp.vim
index 5ea52ec502..1c725a4bfd 100644
--- a/runtime/syntax/cpp.vim
+++ b/runtime/syntax/cpp.vim
@@ -7,6 +7,7 @@
 "   2024 May 04 by Vim Project fix digit separator in octals and floats
 "   2026 Jan 06 by Vim Project orphaning announcement
 "   2026 Jan 08 by Vim Project highlight capital letter prefixes for numbers
+"   2026 May 29 by Vim Project add C++23 stdfloat types (#16498)
 
 " quit when a syntax file was already loaded
 if exists("b:current_syntax")
@@ -104,6 +105,11 @@ if !exists("cpp_no_cpp20")
   syn keyword cppModule		import module export
 endif
 
+" C++ 23 extensions
+if !exists("cpp_no_cpp23")
+  syn keyword cppType		float16_t float32_t float64_t float128_t bfloat16_t
+endif
+
 " The minimum and maximum operators in GNU C++
 syn match cppMinMax "[<>]?"