| When You Know | |
| Type: | Studio |
| Artist: | Dianne Reeves |
| Cover: | File:DReeves_WhenYouKnow.jpg |
| Released: | April 15, 2008 |
| Studio: | NRG |
| Length: | 53:14 |
| Label: | Blue Note |
| Prev Title: | Good Night, and Good Luck (Soundtrack) |
| Prev Year: | 2005 |
| Next Title: | Beautiful Life |
| Next Year: | 2014 |
When You Know is an album by American jazz singer Dianne Reeves. It was released on April 15, 2008 via Blue Note Records.