The 2015–16 British and Irish Cup was the seventh season of the annual rugby union competition for second tier, semi-professional clubs from Britain and Ireland. Worcester Warriors were the defending champions having won the 2014–15 final against Doncaster Knights 35–5 at Castle Park, Doncaster on 3 April 2015. There have been five different winners and six different losing finalists of the competition in the six seasons of its existence. The format of the competition was similar to last season with Scottish clubs not competing. This season the four Welsh teams are the reserve sides of the teams competing in the Pro 12 competition instead of clubs from the Welsh Premier Division.