diff --git a/.gitignore b/.gitignore
index b6c285234..ae71cbbbd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -839,6 +839,7 @@
 /memcheck/tests/bug155125
 /memcheck/tests/bug287260
 /memcheck/tests/bug340392
+/memcheck/tests/bug464969_d_demangle
 /memcheck/tests/calloc-overflow
 /memcheck/tests/cdebug_zlib
 /memcheck/tests/cdebug_zlib_gnu
diff --git a/NEWS b/NEWS
index 7990a8a56..5e61efbbf 100644
--- a/NEWS
+++ b/NEWS
@@ -93,6 +93,7 @@ are not entered into bugzilla tend to get forgotten about or ignored.
 463027  broken check for MPX instruction support in assembler
 464476  Firefox fails to start under Valgrind
 464859  Build failures with GCC-13 (drd tsan_unittest)
+464969  D language demangling
 
 To see details of a given bug, visit
   https://bugs.kde.org/show_bug.cgi?id=XXXXXX
diff --git a/coregrind/m_demangle/demangle.c b/coregrind/m_demangle/demangle.c
index 3fd7cb75f..a4031dc8a 100644
--- a/coregrind/m_demangle/demangle.c
+++ b/coregrind/m_demangle/demangle.c
@@ -121,10 +121,12 @@ void VG_(demangle) ( Bool do_cxx_demangling, Bool do_z_demangling,
    // - C++ mangled symbols start with "_Z" (possibly with exceptions?)
    // - Rust "legacy" mangled symbols start with "_Z".
    // - Rust "v0" mangled symbols start with "_R".
+   // - D programming language mangled symbols start with "_D".
    // XXX: the Java/Rust/Ada demangling here probably doesn't work. See
    // https://bugs.kde.org/show_bug.cgi?id=445235 for details.
    if (do_cxx_demangling && VG_(clo_demangle)
-       && orig != NULL && orig[0] == '_' && (orig[1] == 'Z' || orig[1] == 'R')) {
+       && orig != NULL && orig[0] == '_'
+       && (orig[1] == 'Z' || orig[1] == 'R' || orig[1] == 'D')) {
       /* !!! vvv STATIC vvv !!! */
       static HChar* demangled = NULL;
       /* !!! ^^^ STATIC ^^^ !!! */
@@ -134,7 +136,11 @@ void VG_(demangle) ( Bool do_cxx_demangling, Bool do_z_demangling,
          VG_(arena_free) (VG_AR_DEMANGLE, demangled);
          demangled = NULL;
       }
-      demangled = ML_(cplus_demangle) ( orig, DMGL_ANSI | DMGL_PARAMS );
+      if (orig[1] == 'D') {
+        demangled = dlang_demangle ( orig, DMGL_ANSI | DMGL_PARAMS );
+      } else {
+        demangled = ML_(cplus_demangle) ( orig, DMGL_ANSI | DMGL_PARAMS );
+      }
 
       *result = (demangled == NULL) ? orig : demangled;
    } else {
diff --git a/memcheck/tests/Makefile.am b/memcheck/tests/Makefile.am
index aa936ac05..1be744eba 100644
--- a/memcheck/tests/Makefile.am
+++ b/memcheck/tests/Makefile.am
@@ -114,6 +114,8 @@ EXTRA_DIST = \
 	bug155125.stderr.exp bug155125.vgtest \
 	bug287260.stderr.exp bug287260.vgtest \
 	bug340392.stderr.exp bug340392.vgtest \
+	bug464969_d_demangle.stderr.exp bug464969_d_demangle.vgtest \
+		bug464969_d_demangle.stdout.exp \
 	calloc-overflow.stderr.exp calloc-overflow.vgtest\
 	cdebug_zlib.stderr.exp cdebug_zlib.vgtest \
 	cdebug_zlib_gnu.stderr.exp cdebug_zlib_gnu.vgtest \
@@ -381,6 +383,7 @@ check_PROGRAMS = \
 	bug155125 \
 	bug287260 \
 	bug340392 \
+	bug464969_d_demangle \
 	calloc-overflow \
 	client-msg \
 	clientperm \
@@ -462,6 +465,8 @@ if DWARF4
 check_PROGRAMS += dw4
 endif
 
+bug464969_d_demangle_SOURCES = bug464969_d_demangle.cpp
+
 if GZ_ZLIB
 check_PROGRAMS += cdebug_zlib
 cdebug_zlib_SOURCES = cdebug.c
diff --git a/memcheck/tests/bug464969_d_demangle.cpp b/memcheck/tests/bug464969_d_demangle.cpp
new file mode 100644
index 000000000..b66c79b38
--- /dev/null
+++ b/memcheck/tests/bug464969_d_demangle.cpp
@@ -0,0 +1,17 @@
+#include <iostream>
+
+extern "C" void _D4test4findFiPxaZPxa()
+{
+   int a;
+   if (a)
+      std::cout << "a\n";
+   else
+      std::cout << "!a\n";
+}
+
+int main()
+{
+   _D4test4findFiPxaZPxa();
+}
+
+
diff --git a/memcheck/tests/bug464969_d_demangle.stderr.exp b/memcheck/tests/bug464969_d_demangle.stderr.exp
new file mode 100644
index 000000000..e2c5b0b25
--- /dev/null
+++ b/memcheck/tests/bug464969_d_demangle.stderr.exp
@@ -0,0 +1,4 @@
+Conditional jump or move depends on uninitialised value(s)
+   at 0x........: test.find(int, const(char)*) (bug464969_d_demangle.cpp:6)
+   by 0x........: main (bug464969_d_demangle.cpp:14)
+
diff --git a/memcheck/tests/bug464969_d_demangle.stdout.exp b/memcheck/tests/bug464969_d_demangle.stdout.exp
new file mode 100644
index 000000000..60fc87476
--- /dev/null
+++ b/memcheck/tests/bug464969_d_demangle.stdout.exp
@@ -0,0 +1 @@
+!a
diff --git a/memcheck/tests/bug464969_d_demangle.vgtest b/memcheck/tests/bug464969_d_demangle.vgtest
new file mode 100644
index 000000000..bf20ace9e
--- /dev/null
+++ b/memcheck/tests/bug464969_d_demangle.vgtest
@@ -0,0 +1,2 @@
+prog: bug464969_d_demangle
+vgopts: -q