The Lancashire Cup was an English Rugby Football Union competition founded in 1971.

It was organized by the Lancashire Rugby Football Union and was open to all eligible clubs in the Lancashire region including a number of clubs in Cheshire and Merseyside.

The men's competition was discontinued at the end of 2013 as there were not enough teams willing to participate in the cup (partly due to the increased demands of league rugby).

This lack of competitive rugby meant that Lancashire had a smaller membership of clubs when compared to its counterpart.

Some of the current clubs competing seem to be based outside of Lancashire, such as Liverpool St Helens and Waterloo, but when the Lancashire RFU was founded, places like Merseyside and Liverpool were part of the county, and these teams have retained their membership.