| Gain | |
| Type: | EP |
| Artist: | サディ |
| Cover: | Gain (EP).jpg |
| Released: | December 30, 2009 |
| Genre: | Metal |
| Length: | 27:18 |
| Label: | MAJESTIC |
| Producer: | Sadie |
| Prev Title: | Master of Romance |
| Prev Year: | 2009 |
| Next Title: | SINGLES |
| Next Year: | 2010 |
Gain is an EP released by Sadie on December 30, 2009. It was released in 2 editions, a regular edition with the bonus track 'Regret' and a limited edition with a DVD containing the music video for 'ever' and also a slipcase.