Keroularios (Greek: Κηρουλάριος), Latinized as Cerularius, is a Greek surname. It was the name of an influential Byzantine family active during the 11th century.
Notable individuals with the surname Keroularios include:
Michael I Cerularius ( 1000 – 21 January 1059), Ecumenical Patriarch of Constantinople from 1043 to 1058; played a major role in the 11th century Great Schism Constantine Keroularios ( 11th century), Byzantine official