diff --git a/include/wx/string.h b/include/wx/string.h
index 77c8b0126b..57fbb56616 100644
--- a/include/wx/string.h
+++ b/include/wx/string.h
@@ -49,6 +49,11 @@
     #endif
 #endif
 
+// Check if C++20 three-way-comparison operator is available
+#ifdef __cpp_impl_three_way_comparison
+    #include <compare>
+#endif
+
 #include "wx/afterstd.h"
 
 // by default we cache the mapping of the positions in UTF-8 string to the byte
@@ -2288,6 +2293,19 @@ public:
   friend bool operator>=(const wxString& s1, const wxString& s2)
       { return s1.Cmp(s2) >= 0; }
 
+#ifdef __cpp_impl_three_way_comparison
+  friend auto operator<=>(const wxString& s1, const wxString& s2)
+  {
+      const int cmp = s1.Cmp(s2);
+      if (cmp < 0)
+          return std::strong_ordering::less;
+      else if (cmp > 0)
+          return std::strong_ordering::greater;
+      else
+          return std::strong_ordering::equal;
+  }
+#endif
+
   friend bool operator==(const wxString& s1, const wxCStrData& s2)
       { return s1 == s2.AsString(); }
   friend bool operator==(const wxCStrData& s1, const wxString& s2)
diff --git a/tests/strings/strings.cpp b/tests/strings/strings.cpp
index 7e0d2466b4..c37a22149f 100644
--- a/tests/strings/strings.cpp
+++ b/tests/strings/strings.cpp
@@ -453,6 +453,21 @@ TEST_CASE("StringCompare", "[wxString]")
     CHECK( wxString("!").Cmp("z") < 0 );
 }
 
+#ifdef __cpp_lib_three_way_comparison
+TEST_CASE("StringCompareThreeWay", "[wxString]")
+{
+    // test that operator<=> works and compares by string contents
+
+    wxString a(wxT("bar"));
+    wxString b(wxT("bar"));
+    wxString c(wxT("baz"));
+
+    CHECK((a <=> b) == std::strong_ordering::equal);
+    CHECK((a <=> c) == std::strong_ordering::less);
+    CHECK((c <=> a) == std::strong_ordering::greater);
+}
+#endif // __cpp_lib_three_way_comparison
+
 TEST_CASE("StringCompareNoCase", "[wxString]")
 {
     wxString s1 = wxT("AHH");