Sebastian Sylvester (born 9 July 1980) is a German former professional boxer who competed from 2002 to 2011 and held the IBF middleweight title from 2009 to 2011.

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In March 2007 Sylvester retained the WBA Inter-Continental Middleweight Title against Alessio Furlan at the Stadthalle, Rostock, Germany.

On 2 November 2008, Felix Sturm retained the WBA middleweight title via unanimous decision (118-110, 118-110 and 119-109) over Sylvester. He improved to 31-2-1, while Sylvester fell to 31–3.^[1]

He won the vacant IBF middleweight title by beating Giovanni Lorenzo on 19 September 2009 by split decision.^[2]

• List of middleweight boxing champions