| Birth Date: | 6 April 1974 |
| Birth Place: | Lyon, France |
| Weight: | 110kg (240lb) |
| Ru Position: | Hooker |
| Ru Clubyears: | 1997-98 1998-2000 2000-2002 2002-2008 2008-2010 2010-2011 |
| Ru Proclubs: | Stade Français RC Nîmes Bègles-Bordeaux Racing Métro 92 RC Nîmes |
| Ru Clubcaps: | 7 118 41 0 |
| Ru Clubpoints: | (0) (75) 15t (5) 1t (0) |
Olivier Diomandé (born April 6, 1974 in Lyon, France) is a French-born Ivorian rugby union player. He plays as a hooker.
Diomandé played for Club Sportif Annonay (1992/93-1993/94), US Romans (1994/95-1996/97), Stade Français (1997/98), RC Nîmes (1998/99-1999/2000), Bègles-Bordeaux (2000/01-2001/02), Montpellier Hérault (2002/03-2007/08), Racing Métro 92 (2007/08-2009/10) and RC Nîmes, since 2010/11, at the Fédérale 2. He won the Pro D2 with Montpellier Hérault, in 2002/03, and the European Challenge Cup, in 2004. He won again the Pro D2 for Racing Métro 92, in 2008/09.
He plays for Côte d'Ivoire at international level.