| Minorplanet: | yes |
| Background: |
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| Label Width: | 8em |
| 357 Ninina | |
| Discovered: | 11 February 1893 |
| Mpc Name: | (357) Ninina |
| Alt Names: | 1893 J |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 3.15623AU |
| Perihelion: | 2.92272AU |
| Aphelion: | 3.38973abbr=onNaNabbr=on |
| Eccentricity: | 0.073982 |
| Inclination: | 15.0642° |
| Asc Node: | 137.809° |
| Arg Peri: | 254.250° |
| Rotation: | 36.0105abbr=onNaNabbr=on |
| Abs Magnitude: | 8.72 |
| Mean Motion: | / day |
| Observation Arc: | 108.56 yr (39650 d) |
| Uncertainty: | 0 |
357 Ninina is a large main-belt asteroid. It was discovered by Auguste Charlois on February 11, 1893, in Nice. The reference of its name is not known, though Ninine is a French personal name. This minor planet is orbiting at a distance of from the Sun with a period of 2048.1days and an orbital eccentricity (ovalness) of 0.074. The orbital plane is inclined at an angle of 15.1° to the plane of the ecliptic.
Photometric observations of 357 Ninina during 2023 provided a light curve that presents an Earth commensurate rotation period of with a brightness amplitude of in magnitude. In 2024, spin shape modelling using the light curve inversion technique show a blocky, rounded figure, with a refined rotation period of