Robyn Jean Thorn (born 26 November 1945), also known by her married name Robyn Nock, is an Australian former freestyle swimmer who won the silver medal in the 4×100-metre freestyle relay at the 1964 Summer Olympics in Tokyo. Coming from Kingaroy, Queensland, Thorn spent the majority of her career in the shadow of fellow Australian Dawn Fraser. Making her debut in the 1962 Commonwealth Games in Perth, Western Australia, Thorn was part of the winning 4×110-yard freestyle relay team, and won silver in the corresponding individual event behind Fraser. Two years later in Tokyo, Thorn was a semifinalist in the 100-metre freestyle, won by Fraser. She combined with Fraser, Lyn Bell and Janice Murphy to finish second, 3.1 seconds behind the United States. See also List of Olympic medalists in swimming (women) References 1945 births Living people Olympic swimmers of Australia Australian female freestyle swimmers Sportswomen from Queensland Swimmers at the 1964 Summer Olympics Medalists at the 1964 Summer Olympics Olympic silver medalists for Australia Olympic silver medalists in swimming Swimmers at the 1962 British Empire and Commonwealth Games Commonwealth Games medallists in swimming Commonwealth Games silver medallists for Australia Commonwealth Games gold medallists for Australia 20th-century Australian women Medallists at the 1962 British Empire and Commonwealth Games