Ralf Isau (born 2 March 1956, in Berlin) is a German author of fantasy novels, often archaeology-themed.

He received the 1997 Buxtehuder Bulle for his novels Das Museum der gestohlenen Erinnerungen and Das Netz der Schattenspiele.

Isau formerly worked as an IT consultant.

He lives in Stuttgart, is married and has a daughter.