The Metro Manila Film Festival Award for Best Supporting Actress is an award presented annually by the Metropolitan Manila Development Authority (MMDA). It was first awarded at the 1st Metro Manila Film Festival ceremony, held in 1975; Nida Blanca received the award for his role in Batu-Bato sa Langit and it is given in honor of an actor who has delivered an outstanding performance in a supporting role while working within the film industry. Currently, nominees and winners are determined by Executive Committees, headed by the Metropolitan Manila Development Authority Chairman and key members of the film industry.

The 1st Metro Manila Film Festival, also known then as the 1975 Metropolitan Film Festival, was held on September 21, 1975, in Manila to commemorate the third anniversary of the continuation of Martial Law.