Casaus is a Spanish surname. Notable people with the surname include:
Albert de Casaus (died 1544) was the Master of the Order of Preachers Luis Figueroa y Casaus (1781–1853), Spanish soldier, businessman, and merchant Martin Casaus (born 1985), American entrepreneur, content creator, and professional wrestler Nicolau Casaus (1913–2007), Catalan businessman and sports leader Yolanda Casaus Rodríguez (born 1974), Spanish politician
See also Jesus M. Casaus House Casau, decentralized municipal entity in Lleida, Catalonia