Samuel Gregory Underhill is a professional rugby union player who plays as a flanker for Premiership Rugby club Bath. Born in the United States when his father served overseas in the Royal Air Force, he moved back to the UK aged 1 year old. He was brought up in Peterborough and then moved to Gloucestershire where he played for Sir Thomas Rich’s School, Longlevens RFC and Gloucester Academy. He represents England at international level.

Bath Rugby is a professional rugby union club in Bath, Somerset, England. They play in Premiership Rugby, England's top division of rugby. Founded in 1865 as Bath Football Club, since 1894 the club has played at the Recreation Ground in the city centre.