diff --git a/gc.c b/gc.c
index a43405e6..405f3173 100644
--- a/gc.c
+++ b/gc.c
@@ -341,6 +341,13 @@ char *gc_copy_obj(object dest, char *obj, gc_thread_data *thd)
       // NOTE: don't copy mutex itself, caller will do that (this is a special case)
       return (char *)hp;
     }
+    case cond_var_tag: {
+      cond_var_type *hp = dest;
+      mark(hp) = thd->gc_alloc_color;
+      type_of(hp) = cond_var_tag;
+      // NOTE: don't copy cond_var itself, caller will do that (this is a special case)
+      return (char *)hp;
+    }
     case forward_tag:
       return (char *)forward(obj);
     case eof_tag:
@@ -469,6 +476,7 @@ size_t gc_allocated_bytes(object obj, gc_free_list *q, gc_free_list *r)
   if (t == port_tag) return gc_heap_align(sizeof(port_type));
   if (t == cvar_tag) return gc_heap_align(sizeof(cvar_type));
   if (t == mutex_tag) return gc_heap_align(sizeof(mutex_type));
+  if (t == cond_var_tag) return gc_heap_align(sizeof(cond_var_type));
   
   fprintf(stderr, "gc_allocated_bytes: unexpected object %p of type %ld\n", obj, t);
   exit(1);
@@ -569,6 +577,14 @@ size_t gc_sweep(gc_heap *h, size_t *sum_freed_ptr)
             fprintf(stderr, "Error destroying mutex\n");
             exit(1);
           }
+        } else if (type_of(p) == cond_var_tag) {
+#if GC_DEBUG_VERBOSE
+          fprintf(stderr, "pthread_cond_destroy from sweep\n");
+#endif
+          if (pthread_cond_destroy(&(((cond_var)p)->lock)) != 0) {
+            fprintf(stderr, "Error destroying condition variable\n");
+            exit(1);
+          }
         }
         // free p
         heap_freed += size;
diff --git a/include/cyclone/runtime.h b/include/cyclone/runtime.h
index 7a042b1c..446f21ef 100644
--- a/include/cyclone/runtime.h
+++ b/include/cyclone/runtime.h
@@ -31,6 +31,7 @@
 #define Cyc_check_vec(d,obj) Cyc_check_type(d,Cyc_is_vector, vector_tag, obj);
 #define Cyc_check_port(d,obj) Cyc_check_type(d,Cyc_is_port, port_tag, obj);
 #define Cyc_check_mutex(d,obj) Cyc_check_type(d,Cyc_is_mutex, mutex_tag, obj);
+#define Cyc_check_cond_var(d,obj) Cyc_check_type(d,Cyc_is_cond_var, cond_var_tag, obj);
 void Cyc_invalid_type_error(void *data, int tag, object found);
 void Cyc_check_obj(void *data, int tag, object obj);
 void Cyc_check_bounds(void *data, const char *label, int len, int index);
@@ -192,6 +193,7 @@ object Cyc_is_integer(object o);
 object Cyc_is_vector(object o);
 object Cyc_is_port(object o);
 object Cyc_is_mutex(object o);
+object Cyc_is_cond_var(object o);
 object Cyc_is_symbol(object o);
 object Cyc_is_string(object o);
 object Cyc_is_char(object o);
diff --git a/include/cyclone/types.h b/include/cyclone/types.h
index 49e0cf80..a315735b 100644
--- a/include/cyclone/types.h
+++ b/include/cyclone/types.h
@@ -188,6 +188,7 @@ typedef long tag_type;
 #define vector_tag 17
 #define macro_tag 18
 #define mutex_tag 19
+#define cond_var_tag 20
 
 #define nil NULL
 #define eq(x,y) (x == y)
@@ -224,6 +225,10 @@ typedef cvar_type *cvar;
 typedef struct {gc_header_type hdr; tag_type tag; pthread_mutex_t lock;} mutex_type;
 typedef mutex_type *mutex;
 
+/* Define condition variable type */
+typedef struct {gc_header_type hdr; tag_type tag; pthread_cond_t lock;} cond_var_type;
+typedef cond_var_type *cond_var;
+
 /* Define boolean type. */
 typedef struct {gc_header_type hdr; const tag_type tag; const char *pname;} boolean_type;
 typedef boolean_type *boolean;
diff --git a/runtime.c b/runtime.c
index a91f344a..4e61a019 100644
--- a/runtime.c
+++ b/runtime.c
@@ -27,7 +27,7 @@ object Cyc_global_set(void *thd, object *glo, object value)
 
 /* Error checking section - type mismatch, num args, etc */
 /* Type names to use for error messages */
-const char *tag_names[21] = { \
+const char *tag_names[22] = { \
    "pair" \
  , "symbol" \
  , "" \
@@ -48,6 +48,7 @@ const char *tag_names[21] = { \
  , "vector" \
  , "macro" \
  , "mutex" \
+ , "condition variable" \
  , "Reserved for future use" };
 
 void Cyc_invalid_type_error(void *data, int tag, object found) {
@@ -550,6 +551,9 @@ object Cyc_display(object x, FILE *port)
     case mutex_tag:
       fprintf(port, "<mutex %p>", x);
       break;
+    case cond_var_tag:
+      fprintf(port, "<condition variable %p>", x);
+      break;
     case boolean_tag:
       fprintf(port, "#%s",((boolean_type *) x)->pname);
       break;
@@ -836,6 +840,11 @@ object Cyc_is_mutex(object o){
         return boolean_t;
     return boolean_f;}
 
+object Cyc_is_cond_var(object o){
+    if (!nullp(o) && !is_value_type(o) && ((list)o)->tag == cond_var_tag)
+        return boolean_t;
+    return boolean_f;}
+
 object Cyc_is_string(object o){
     if (!nullp(o) && !is_value_type(o) && ((list)o)->tag == string_tag)
         return boolean_t;