| 1st Fleet | |
|---|---|
| Active | 28 December 1903 – 25 February 1944 |
| Country |  |
| Branch |  Imperial Japanese Navy |
| Commanders | |
| Notable commanders | Heihachiro Togo Kōichi Fujii Osami Nagano Isoroku Yamamoto Chuichi Nagumo |
The 1st Fleet (第一艦隊, Dai-ichi Kantai) was the main battleship fleet of the Imperial Japanese Navy.