John Alexander Fleck is a Scottish professional footballer who currently plays for Premier League club Sheffield United as a midfielder.

He began his career with Rangers, making his senior debut in 2008 at the age of 16, and was hailed as a potential star in the media. He then spent time on loan at Blackpool. He moved to Coventry City in 2012 and stayed there until 2016, when he joined Sheffield United, where he helped the team gain two promotions in three years, going up from League One to the Premier League.