The 2012–13 British and Irish Cup was the fourth season of the annual rugby union competition for second tier, semi-professional clubs from Britain and Ireland. The final was contest on 17 May 2013 and won by Leinster A with a 78th minute penalty by Noel Reid to beat Newcastle Falcons 18–17 at their home ground Kingston Park. The defending champions Munster A were eliminated in the semi–finals by the eventual winners and Bedford Blues was the other losing semi–finalists.