The 33-year-old midfielder only joined Sean Dyche's Clarets last summer after leaving the relegated Queen's Park Rangers but had an enormous impact at Turf Moor.
The former Manchester City and Newcastle United man helped guide the Lancashire club to the Championship title, which was clinched with a 3-0 win at Charlton Athletic on Saturday, and has now been rewarded for his consistent performances with the top individual prize at the end-of-season awards night.
Barton scooped the award, as voted for by the fans, while defender Ben Mee won the Players' Player of the Year, which was voted for by the playing group.
The Player of the Year for the 2015/16 season is this charming man...@Joey7Barton! #Championspic.twitter.com/WfJamYy1fB
— Burnley FC (@BurnleyOfficial) May 8, 2016