| Ioanna Vlachou | |
| Nationality: | Greek |
| Birth Date: | 14 May 1981 |
| Height: | 1.670NaN0 |
| Weight: | 63kg (139lb) |
| Spike: | 278cm (109inches) |
| Block: | 270cm (110inches) |
| Years: | 2002-2005 2006-2010 |
| Teams: | Filathlitikos Olympiacos |
| Nationalteam: |  Greece |
| Medaltemplates-Expand: | set to "yes" to auto-expand medaltemplates section |
Ioanna "Gianna" Vlachou (born 14 May 1981)[1] is a Greek volleyball player. She was part of the Greece women's national volleyball team. She competed with the national team at the 2004 Summer Olympics in Athens, Greece.[2] She played most notably for Olympiacos and Filathlitikos.[3]
• 1991-2002 Aias evosmou
• 2002-2005 Filathlitikos Thessaloniki
• 2005-2006 Apollonios Keratsiniou
• 2006-2010 Olympiacos
• 2010-2011 SAAK Anatolia