| S/2018 J 3 | |
| Discoverer: | Scott S. Sheppard |
| Discovery Site: | Las Campanas Obs. |
| Discovered: | 12 May 2018 |
| Epoch: | 25 February 2023 (JD 2460000.5) |
| Observation Arc: | 4.35 yr (1590 d) |
| Eccentricity: | 0.2731285 |
| Period: | –1.93 yr (–704.56 days) |
| Mean Anomaly: | 16.59790° |
| Mean Motion: | / day |
| Inclination: | 164.90043° |
| Asc Node: | 240.00514° |
| Arg Peri: | 296.52870° |
| Satellite Of: | Jupiter |
| Group: | Carme group |
| Mean Diameter: | ≈ |
| Magnitude: | 23.9 |
| Abs Magnitude: | 17.3 |
S/2018 J 3 is a small outer natural satellite of Jupiter discovered by Scott S. Sheppard on 12 May 2018, using the 6.5-meter Magellan-Baade Telescope at Las Campanas Observatory, Chile. It was announced by the Minor Planet Center on 19 January 2023, after observations were collected over a long enough time span to confirm the satellite's orbit.
S/2018 J 3 is part of the Carme group, a tight cluster of retrograde irregular moons of Jupiter that follow similar orbits to Carme at semi-major axes between NaNe6km, orbital eccentricities between 0.2–0.3, and inclinations between 163–166°. It has a diameter of about for an absolute magnitude of 17.3, making it one of Jupiter's smallest known moons.