William Mocquet (born 23 January 1983) is a French former footballer. Mocquet, who was capped for the French Under-21 side, played as a midfielder. Mocquet left Le Havre and signed for Sunderland on 22 August 2006 for an undisclosed fee, in a two-year deal. However, he found himself on the sidelines and was loaned to League Two sides Rochdale (where he scored once against Boston United) and Bury. He was released at the end of the 2006-07 season.