Dean James Lyness (born 20 July 1991) is an English footballer who plays as a goalkeeper for Scottish Championship club Hamilton Academical.
Lyness began his career as a youngster with Birmingham City, but never played for the first team. He signed for Scottish Premier League club Heart of Midlothian in 2009, and spent a spell on loan at East Fife of the Scottish Second Division, but again, never played first-team football. On returning to England in 2011, he spent a season with Conference Premier club Kidderminster Harriers, playing ten matches, and then joined Burton Albion, with whom he made his first appearance in the Football League. He spent two spells on loan to Blackpool before joining the club on a permanent basis in 2016. He signed for Nuneaton Town in August 2017. In international football, Lyness was capped four times for England at under-17 level.