Tremayne Rodd, 3rd Baron Rennell

John Adrian Tremayne Rodd, 3rd Baron Rennell (28 June 1935 – 9 December 2006) was a British naval officer, Scottish rugby union player and businessman.

John Adrian Tremayne Rodd was the younger son of Gustaf Guthrie Rennell Rodd, a Commander in the Royal Navy, and his wife, the former Yvonne Mary Marling, a singing teacher and co-author of Singing, the Physical Nature of the Vocal Organ.

His uncles and aunts also included the life peer the Baroness Emmet of Amberley, and, through marriage, the artist Simon Elwes and Nancy Mitford.

As Tremayne Rodd, he won 14 caps as a scrum-half for Scotland between 1958 and 1965, battling for his place with Stan Coughtrie and Alex Hastie.

Rodd actively participated in many sports including; rugby for several Parliamentary teams, cricket, golf, bridge, backgammon and chess.

In 2000 he was the team leader for Vladimir Kramnik in London when he won the World Chess Championship from Garry Kasparov.