Tom Ormsby Jameson (4 April 1892 in Clonsilla, County Dublin, Ireland – 6 February 1965 in Dun Laoghaire, County Dublin) was an Irish cricketer. A right-handed batsman and right-arm fast and leg spin bowler, he played just twice for the Ireland cricket team between 1926 and 1928 in first-class matches, but played 124 first-class matches in all mainly for Hampshire and the MCC.