Declan Patrick Gallagher (born 13 February 1991) is a Scottish professional footballer who plays as a centre-back for Scottish Premiership club St Mirren and the Scotland national team. Gallagher started his career at Celtic but never made a first team appearance, however he was involved in their Scottish Youth Cup win in 2010. He was then sent out on loan to Stranraer to gain some first team experience. Despite impressing while on loan, he was released and was signed by Clyde before moving on to join Dundee. After experiencing a relegation followed by a promotion in two seasons at Dens Park, he joined Livingston in 2014.