Benjamin Santos Abalos Sr. (born September 21, 1934) is a Filipino politician who currently serves as the mayor of Mandaluyong, Metro Manila since 2022, a position he also held from 1986 to 1987 and from 1988 to 1998. He also served as a chairman of the Commission on Elections and chairman of the MMDA. He is the father of former Mandaluyong mayor and Interior and Local Government Secretary Benjamin "Benhur" Abalos Jr.