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Benjamin Kayser (born 26 July 1984) is a French former rugby union player. He most recently played at hooker for Clermont Auvergne in the French Top 14. Kayser rejoined Stade Français at the end of the 2008/2009 season from Leicester Tigers in the Guinness Premiership, who he joined during the 2007–08 season. While at Leicester he played as a replacement as they won the 2009 Premiership final. Kayser signed for Castres Olympique for the 2010–11 Top 14 season. In February 2011, Kayser signed a 3-year contract with ASM Clermont Auvergne.