Jon Welsh (born 13 October 1986) is a Scottish international rugby union player, most recently with Newcastle Falcons.

Welsh begun playing professionally for Glasgow Warriors around 2008 and was named in the Pro12 Dream Team at the end of the 2011/12 season.

After a twelve-month hiatus, in January 2021 Welsh rejoined the Falcons on a short-term deal until the end of the season.

On 1 September 2015 Welsh was named in Vern Cotter's Scotland squad for the 2015 Rugby World Cup.

Scotland were defending a 34–32 lead going into the final minutes when a penalty was given by referee Craig Joubert for an apparent offside offence committed by Welsh.