Civil Service NI Rugby Football Club is a rugby union club based in Maynard Sinclair Pavilion of Belfast, Northern Ireland. The club was formed in the autumn of 1922 by staff of the newly established Northern Ireland Civil Service. After some years of success playing at a junior level, the club was given senior status by the Ulster Branch in the 1928/29 season and celebrated by winning the senior league at its first attempt. Up until World War II, Civil Service teams enjoyed high placings in the league tables but struggled to convert good performances into trophies.