Mark Alexander Wallace (born 19 November 1981 in Abergavenny) is a Welsh cricketer; a left-handed batsman and wicket-keeper.

Wallace made his second XI debut for Glamorgan at the age of just 15, and by 1998 he was in the England U-19 team that played Pakistan, as well as accompanying them to New Zealand the following winter and playing three one-day games against Australia U-19s in the summer of 1999, a year in which he won the NBC Denis Compton Award.

In September 1999, he made his bow in first-class cricket, appearing in the County Championship game against Somerset at the age of 17 years and 287 days - thus making him Glamorgan's youngest ever Championship wicket-keeper. Wallace took five catches in the match, and scored 28 from number nine in the first innings, and this was enough for him to keep his county place for the rest of the season. In an innings victory over Yorkshire, he made his first half-century: 64 not out, again batting at number nine.