Mounts Bay RFC was a Cornish rugby club formed in December 1999 and based in Penzance, England, which folded in July 2009. Initially formed as an offshoot from Penzance & Newlyn RFC, the club operated as an independent club. Mounts Bay were promoted at the end of the 2007-08 season and competed in National Division Two in the 2008-09 season. However, the club folded in the summer of 2009 due to financial problems and withdrew from the league structure altogether.