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Ato Stephens (born Ato Modibo; 19 June 1979) is a sprinter from Trinidad and Tobago who specialises in the 400 metres. He won a bronze medal at the 2003 CAC Championships, and took the silver at the 2005 edition. He is married to Cydonie Mothersille, a sprinter for the Cayman Islands.
He has competed at the Summer Olympics three times, but did not progress beyond the heats at the 2000, 2004 or 2008 editions. Stephens ran at the World Championships in Athletics in 2001, 2005 and 2007. He has also represented Trinidad and Tobago in the 4×400 metres relay. His best performances in major competitions include a third-place finish in the semifinals at the 2007 World Championships and fourth in the semifinals at the 2006 Commonwealth Games.
He failed a drugs test at an international competition in May 2009, testing positive for Oxandrolone, Stanozolol and Tamoxifen. He was banned from competition for two years for the infraction.