Sylvia Dethier (born 20 May 1965 in Acosse) is a retired Belgian athlete who specialised in the sprint hurdles. She represented her country at the 1988 and 1992 Summer Olympics, as well as one outdoor and three indoor World Championships.

Her personal bests are 12.98 seconds in the 100 metres hurdles (Brussels 1991) and 8.09 seconds in the 60 metres hurdles (Hoboken 1993).

She has a twin sister, Françoise, who was also a hurdler.

Competition record Representing 1983European Junior ChampionshipsSchwechat, Austria11th (sf)100 m hurdles13.921987European Indoor ChampionshipsLiévin, France16th (h)60 m hurdles8.361988Olympic GamesSeoul, South Korea –100 m hurdlesDQ1989European Indoor ChampionshipsThe Hague, Netherlands8th60 m hurdles8.36World Indoor ChampionshipsBudapest, Hungary10th (h)60 m hurdles8.291990European Indoor ChampionshipsGlasgow, United Kingdom9th (h)60 m hurdles8.29Did not start in the semifinals1991World Indoor ChampionshipsSeville, Spain13th (sf)60 m hurdles8.21World ChampionshipsTokyo, Japan12th (sf)100 m hurdles13.181992European Indoor ChampionshipsGenoa, Italy11th (sf)60 m hurdles8.25Olympic GamesBarcelona, Spain21st (qf)100 m hurdles13.321993World Indoor ChampionshipsToronto, Canada8th (h)60 m hurdles8.22Did not finish in the semifinals1994Jeux de la FrancophonieBondoufle, France7th100 m hurdles13.79

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