Mosaddek Hossain Saikat (born 10 December 1995 in Mymensingh, Bangladesh) is a cricketer who has played first-class and List A cricket in Bangladesh since 2013. In 2014-15 he made 250 and 282 in consecutive first-class innings and passed 1000 first-class runs in his 10th match. In October 2015, in his 12th first-class match, he became the first Bangladeshi player to score three double-centuries. He made his Test debut in March 2017.
Hossain is a right-handed batsman and off-spin bowler. He played for Bangladesh in two ICC Under-19 World Cups: in Australia in 2012 and in Abu Dhabi in 2013-14. He captained Bangladesh Under-19 in a two-match series of four-day matches against Sri Lanka Under-19 in April 2013, scoring 107 in the first match and 74 in the second. He then captained the team again in a five-match series of limited-overs matches immediately afterwards, scoring more than 200 runs, including 98 in the third match which Bangladesh win by one wicket. In England later that year, in a "superb all-round performance", he scored 110 not out off 113 balls then took 3 for 38 off 10 overs in a 38-run victory over England Under-19.