John Main Olguin (February 18, 1921 – January 1, 2011) was an American aquarium official who served as the museum director of the Cabrillo Marine Museum, which has since been renamed the Cabrillo Marine Aquarium, from 1949 until 1987, when he became director emeritus. Olguin has been called the "father of recreational whale watching", as he was the founder of the Cabrillo Whalewatch program and a founding member of the American Cetacean Society. In 2012, a new campus of San Pedro High School, the John M. and Muriel Olguin Campus, was opened and named after Olguin and his wife.