The Lionchu or lionhead-ranchu (Thai: สิงห์ลูกผสม) is a variety of goldfish that has resulted from crossbreeding lionheads and ranchus.

[1][2] The Western criteria for lionchus combine the traditional characteristic side-view profiles of the ranchu and the lionhead.

[3] The ranchu's deep body, broad and curved back, and tail placement has been merged with the large headgrowth of the lionhead.

Lionchus do not have dorsal fins, a trait inherited from both parent breeds.

The shishigashira ranchu is a ranchu-like goldfish with small amounts of headgrowth and some having small knobs and bumps on the back (a suggestion that the absence of the dorsal fin had not yet been stabilized at the time).