Usabiaga is a Basque surname. Notable people with this surname include:
Ana Usabiaga (born 1990), Spanish track cyclist Eduardo Usabiaga y Llaguno (1891–1973), Cuban diplomat Irene Usabiaga (born 1993), Spanish road and track cyclist Javier Usabiaga Arroyo (1939–2018), Mexican businessman and politician José Luis Oliveros Usabiaga (born 1983), Mexican politician