diff --git a/Lib/ctypes/__init__.py b/Lib/ctypes/__init__.py
index d2e6a8bfc8..d941036719 100644
--- a/Lib/ctypes/__init__.py
+++ b/Lib/ctypes/__init__.py
@@ -208,6 +208,7 @@ class c_longdouble(_SimpleCData):
 try:
     class c_double_complex(_SimpleCData):
         _type_ = "C"
+    _check_size(c_double_complex)
 except AttributeError:
     pass
 
diff --git a/Modules/_struct.c b/Modules/_struct.c
index 6a68478dd4..caf4975413 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -12,6 +12,9 @@
 #include "pycore_long.h"          // _PyLong_AsByteArray()
 #include "pycore_moduleobject.h"  // _PyModule_GetState()
 
+#ifdef Py_HAVE_C_COMPLEX
+#  include "_complex.h"           // complex
+#endif
 #include <stddef.h>               // offsetof()
 
 /*[clinic input]
@@ -80,6 +83,9 @@ typedef struct { char c; int x; } st_int;
 typedef struct { char c; long x; } st_long;
 typedef struct { char c; float x; } st_float;
 typedef struct { char c; double x; } st_double;
+#ifdef Py_HAVE_C_COMPLEX
+typedef struct { char c; double complex x; } st_double_complex;
+#endif
 typedef struct { char c; void *x; } st_void_p;
 typedef struct { char c; size_t x; } st_size_t;
 typedef struct { char c; _Bool x; } st_bool;
@@ -89,6 +95,9 @@ typedef struct { char c; _Bool x; } st_bool;
 #define LONG_ALIGN (sizeof(st_long) - sizeof(long))
 #define FLOAT_ALIGN (sizeof(st_float) - sizeof(float))
 #define DOUBLE_ALIGN (sizeof(st_double) - sizeof(double))
+#ifdef Py_HAVE_C_COMPLEX
+#define DOUBLE_COMPLEX_ALIGN (sizeof(st_double_complex) - sizeof(double complex))
+#endif
 #define VOID_P_ALIGN (sizeof(st_void_p) - sizeof(void *))
 #define SIZE_T_ALIGN (sizeof(st_size_t) - sizeof(size_t))
 #define BOOL_ALIGN (sizeof(st_bool) - sizeof(_Bool))
@@ -518,6 +527,17 @@ nu_double(_structmodulestate *state, const char *p, const formatdef *f)
     return PyFloat_FromDouble(x);
 }
 
+#ifdef Py_HAVE_C_COMPLEX
+static PyObject *
+nu_double_complex(_structmodulestate *state, const char *p, const formatdef *f)
+{
+    double complex x;
+
+    memcpy(&x, p, sizeof(x));
+    return PyComplex_FromDoubles(creal(x), cimag(x));
+}
+#endif
+
 static PyObject *
 nu_void_p(_structmodulestate *state, const char *p, const formatdef *f)
 {
@@ -791,6 +811,24 @@ np_double(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
     return 0;
 }
 
+#ifdef Py_HAVE_C_COMPLEX
+static int
+np_double_complex(_structmodulestate *state, char *p, PyObject *v,
+                  const formatdef *f)
+{
+    Py_complex c = PyComplex_AsCComplex(v);
+    double complex x = CMPLX(c.real, c.imag);
+
+    if (c.real == -1 && PyErr_Occurred()) {
+        PyErr_SetString(state->StructError,
+                        "required argument is not a complex");
+        return -1;
+    }
+    memcpy(p, (char *)&x, sizeof(x));
+    return 0;
+}
+#endif
+
 static int
 np_void_p(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
 {
@@ -829,6 +867,9 @@ static const formatdef native_table[] = {
     {'e',       sizeof(short),  SHORT_ALIGN,    nu_halffloat,   np_halffloat},
     {'f',       sizeof(float),  FLOAT_ALIGN,    nu_float,       np_float},
     {'d',       sizeof(double), DOUBLE_ALIGN,   nu_double,      np_double},
+#ifdef Py_HAVE_C_COMPLEX
+    {'C',       sizeof(double complex), DOUBLE_COMPLEX_ALIGN, nu_double_complex, np_double_complex},
+#endif
     {'P',       sizeof(void *), VOID_P_ALIGN,   nu_void_p,      np_void_p},
     {0}
 };