Guy Roland Demel (born 13 June 1981) is an Ivorian former professional footballer who played as a defender. He could play in several positions including right back and centre back. Demel started his career in France with Nîmes Olympique before joining English club Arsenal in 2000. He then played in Germany for ten years, signing for Borussia Dortmund in 2001 and then Hamburger SV in 2005. He returned to England with West Ham United in 2011, leaving the club in 2015 and subsequently joining Dundee United.