Mas Isman (January 1, 1924 in Bondowoso, East Java – December 12, 1982 in Surabaya, East Java) was an Indonesian freedom fighter in East Java when it was part of the Dutch East Indies.
He received a National Hero of Indonesia award from President Joko Widodo on November 5, 2015.Mas Isman was the father of Hayono Isman, Indonesia's Minister of Youth and Sports Affairs.