Gary Mackay-Steven (born 31 August 1990) is a Scottish professional footballer who plays as a winger for Scottish Premiership club Aberdeen.

Having not made the first team at English clubs Liverpool and Fulham, he began his professional career with Airdrie United in January 2011, spending half a season there before moving to top-flight team Dundee United. He remained with Dundee United until February 2015, when he was signed by Celtic for £250,000. He joined Aberdeen in 2017.

Mackay-Steven earned his only cap for the Scotland national football team in 2013.