The 2017–18 British and Irish Cup is the ninth and final season of the annual rugby union competition for second tier, semi-professional clubs from Britain and Ireland.

Munster A are the defending champions having won the 2016–17 final against Jersey Reds 29–28 at Irish Independent Park, Cork on 21 April 2017.

[1][2] The format of the competition is similar to last season with Scottish clubs not competing.

The top side in each pool, plus the three best runners-up, progress to the knockout stage.

First round matches begin on 13 October 2017 and the final will be held in April 2018.