Castleford RFC was a semi-professional rugby league club based in Castleford in the West Riding of Yorkshire, England. They joined the Northern Union in 1896–97 for its second season and remained in the ranks of the (semi) professionals until the end of the 1905–06 season. Not much is known about the original Castleford club, except that they have no connection whatsoever with the present Castleford Tigers RLFC.