Timothy Leo O'Shannessey (born 14 June 1972) is an Australian cyclist.

He won the bronze medal in Men's team pursuit in the 1996 Summer Olympics.

[1][2][3] At the 1994 Commonwealth Games in Victoria, Canada, O'Shannessey won a gold medal in the team pursuit and a bronze medal in the 1000–metre time trial.

[4] Prior to the 2000 Sydney Olympics, O'Shannessey was suspended for two years after returning a test result of a high testosterone level.

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