Antony Ralph Marinon Opatha (5 August 1947 – 11 September 2020) was a Sri Lankan cricketer. A right-arm medium pace bowler, he played five One Day Internationals at the 1975 and 1979 Cricket World Cups. As player/manager of the rebel tour to South Africa in 1982–83 in defiance of the sporting ban against the apartheid state, he and the other tourists received a lifetime ban from international cricket.