Mohammad Mahmudullah (born February 4, 1986 in Mymensingh, Dhaka), also known as Mahmadullah or Riyad, is a Bangladeshi cricketer. He has played First-class and List A cricket for Dhaka Division and has represented Bangladesh 'A' in both forms of the game. An all-rounder, he is a lower or middle-order batsman and a medium pace bowler.
Mahmudullah was called up for Bangladesh's ODI squad for the 3 matches against Sri Lanka in Bangladesh's tour of the country in July 2007. He made his debut on the tour, in the third ODI, where he was Bangladesh's second highest scorer (with 36) and also took 2 wickets, in a match Sri Lanka won by 39 runs. He went on to be picked for Bangladesh's squads for a Quadrangular Series in Kenya in 2007 and the 2007 Twenty20 World Championship.