| Country (sports) |  Monaco |
|---|---|
| Born | 10 December 1975 |
| Height | 1,83m |
| Turned pro | 1995 |
| Retired | 2014 |
| Plays | Right-handed |
| Prize money | $26,278 |
| Singles | |
| Career record | 3–8 |
| Career titles | 0 |
| Highest ranking | No. 569 (28 October 2002) |
| Doubles | |
| Career record | 6–13 |
| Career titles | 0 |
| Highest ranking | No. 839 (28 October 2002) |
Guillaume Couillard (born 10 December 1975) is a professional Monegasque former tennis player and a coach. Couillard reached his career-high ATP Tour singles ranking of World No. 569 in October 2002. He primarily played on the Futures circuit and the Challenger circuit.