Alvaldi is a natural satellite of Saturn in the NASA/JPL Solar System Dynamics planetary satellite tables.
- Planet: Saturn
- Satellite: Alvaldi
- Satellite code: 665
- Physical parameters: not listed in the NASA/JPL planetary satellite physical parameters table
- Ephemeris: SAT456
- Reference frame: ecliptic
- Epoch (TDB): 2000-01-01.5
- Semi-major axis a: 21993800. km
- Eccentricity e: 0.238
- Argument of periapsis ω: 188.1 deg
- Mean anomaly M: 38.3 deg
- Inclination i: 177.4 deg
- Longitude of ascending node: 321.8 deg
- Sidereal period P: 1217.8042 days
- Argument of periapsis precession period: 171.9 yr
- Longitude of ascending node precession period: 320.8 yr
- Mean elements reference: 48