Frédéric Xhonneux (born 11 May 1983 in Brussels) is a Belgian track and field athlete who competes in the decathlon. He is the current Belgian record holder in the event with a score of 8142 points, achieved in May 2008 in Desenzano del Garda at the Multistars meeting.
| Year | Competition | Venue | Position | Notes |
|---|---|---|---|---|
| 2005 | World Championships | Helsinki, Finland | 14th | Decathlon |
| 2006 | European Championships | Gothenburg, Sweden | 10th | Decathlon |
| 2007 | European Indoor Championships | Birmingham, England | 9th | Heptathlon |
| 2008 | Olympic Games | Beijing, PR China | DNF | Decathlon |