Tom Guest (born 5 July 1984 in Taplow, Buckinghamshire, England) is a rugby union player for London Irish in the Aviva Premiership, playing primarily as a Number 8. Guest can also operate as a Flanker.A graduate of the Harlequins' Academy, he made his Quins debut in the friendly against the Natal Sharks at the Twickenham Stoop on 10 February 2005 and he was also a regular in the team that competed in the Zurich A League over the 2004/05 season.