Jack McGrath (born 11 October 1989) is an Irish rugby union player who plays loosehead prop. He formerly played for Leinster, Ulster and has also played for Ireland and the British and Irish Lions. McGrath made his senior debut for Leinster in April 2010 against Glasgow Warriors, and became a regular member of the team in the 2011-12 season. He went on to make 142 appearances for the province, scoring 12 tries. During his time there, Leinster won the European Rugby Champions Cup twice, the European Rugby Challenge Cup once, the Pro12 twice, and the Pro14 once. He trained with the Ireland team ahead of the 2012 Six Nations Championship. He was named in the 34-man Ireland squad for the 2013 end-of-year rugby union tests, and was praised by Ireland captain Rory Best for his hard work in the s