Lancs/Cheshire Division 3 is a regional EnglishRugby Union league for teams in Cheshire, Merseyside, Lancashire and Greater Manchester. Teams are promoted up into Lancs/Cheshire Division 2 and, as this the basement level for club rugby union for teams in the region, there is no relegation. The current format is a single league involving 11 teams, which is a change from the 2017-18 season when the league was played over two stages involving two regional leagues. Up until the end of the 2016-17 season, this division was known as South Lancs/Cheshire 3. Each season three teams from Lancs/Cheshire Division 3 are picked to take part in the RFU Junior Vase (a national competition for clubs at levels 9-12) - two clubs affiliated with the Cheshire RFU, the other with the Lancashire RFU.
Further league changes were in effect by 2018-19 season as part to restructuring of the northern leagues by the RFU due to 19 Lancashire clubs withdrawing from RFU competitions across the leagues to form their own competitions. This would see the North Lancashire/Cumbria division abolished, with Lancashire-based sides from that league being transferred into Lancs/Cheshire 1, while the Cumbria sides were transferred into Cumbria 1.