Mohammad Mahmudullah (born 4 February 1986), also known as Riyad, is a Bangladeshi cricketer and former captain of the Bangladesh national cricket team in T20I. He has played First-class and List A cricket for Dhaka Division and has represented Bangladesh in all forms of the game. An all-rounder, he is a lower or middle-order batsman as well as an off spin bowler. He has almost 10,000 runs and 150+ wickets. He is prominent for his ability to finish a close limited over game. He is the first Bangladeshi to score a World Cup hundred (3 hundreds in ICC events including back to back hundreds against England and New Zealand). Like Sanath Jayasuriya, Kevin Pietersen, Shoaib Malik, Steve Smith and many more, Mahmudullah started his career as a bowler and then converted into a batsman who could bowl handy off-breaks.

Mahmudullah was called up for Bangladesh's ODI squad for the three-match series 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.