Ninna (仁和) was a Japanese era name (年号,, nengō,; lit. "year name") after Gangyō and before Kanpyō. This period started in February 885 and ended in April 889. The reigning emperors were Kōkō-tennō (光孝天皇) and Uda-tennō (宇多天皇).

| Ninna | 1st | 2nd | 3rd | 4th |
|---|---|---|---|---|
| 885 | 886 | 888 | 889 |
| Preceded by: Gangyō |
Era or nengō: Ninna |
Succeeded by: Kanpyō |