Maiztegui is a surname. Notable people with the surname include:
Isidro B. Maiztegui (1905–1996), Argentine composer Jon Santacana Maiztegui (born 1980), Spanish alpine skier Julio Isidro Maiztegui (1931–1993), Argentine physician and epidemiologist Laura Maiztegui (born 1978), Argentine field hockey player
See also 6307 Maiztegui, a main-belt asteroid