| Pierre Mercier | |
| Birth Date: | 7 June 1982 |
| Birth Place: | Fond Cochon, Haiti |
| Height: | 1.75 m |
| Position: | Defender |
| Years1: | 2001–2002 |
| Years2: | 2002–2003 |
| Years3: | 2003 |
| Years4: | 2004 |
| Years5: | 2004–2005 |
| Years6: | 2005–2006 |
| Years7: | 2006–2007 |
| Years8: | 2007–2008 |
| Years9: | 2008 |
| Years10: | 2009 |
| Years11: | 2009–2010 |
| Clubs11: | Gueugnon |
| Caps11: | 16 |
| Goals11: | 0 |
| Nationalyears1: | 2008 |
| Nationalteam1: | Haiti |
| Nationalcaps1: | 6 |
| Nationalgoals1: | 0 |
Pierre Mercier (born June 7, 1982) is a Haitian former professional footballer who played as a defender. In 2008, he made six appearances for the Haiti national team, playing in the 2010 FIFA World Cup qualifiers. He also holds French citizenship.