The 2016–17 British and Irish Cup was the eighth season of the annual rugby union competition for second tier, semi-professional clubs from Britain and Ireland. London Welsh were the defending champions having won the 2015–16 final against Yorkshire Carnegie 10–33 at Headingley Carnegie Stadium, Leeds on 10 April 2016. There have been six different winners and six different losing finalists in the seven seasons of its existence. The format of the competition is similar to last season with Scottish clubs not competing. For the second consecutive season the four Welsh teams were the reserve sides of the teams competing in the Pro12 competition instead of clubs from the Welsh Premier Division.