Bunkyū (文久) was a Japanese era name (年号,, nengō,; lit. "year name") after Man'en and before Genji. This period spanned the years from February 1861 through February 1864. The reigning emperor was Kōmei-tennō (孝明天皇).

| Keichō | 1st | 2nd | 3rd | 4th |
|---|---|---|---|---|
| 1861 | 1862 | 1863 | 1864 |
| Preceded by: Man'en |
Era or nengō: Bunkyū |
Succeeded by: Genji |