| Osaka Rainy Blues | |
| Cover: | K8-osakarainyblues-2ndsingl.jpg |
| Caption: | Cover |
| Type: | single |
| Artist: | Kanjani8 |
| Album: | KJ1 F.T.O |
| Released: | March 2nd, 2005 |
| Genre: | Pop/R&B |
| Length: | 12:03 |
| Label: | Teichiku Records |
| Composer: | Kouji |
| Lyricist: | MASA |
| Prev Title: | Naniwa Iroha Bushi |
| Prev Year: | 2004 |
| Next Title: | 'Sukiyanen, Osaka/Oh! Enka/Mugendai' |
| Next Year: | 2006 |
is the second single released by the Japanese boyband Kanjani Eight. The single is the group's only single not to reach the top five on the Oricon and the poorest performing single sale wise. The single also marks the last official release that former member, Hiroki Uchi, participated in. The album version of the song had his vocal leads sung over by Ryo Nishikido.