Thrymr (thrim'-ər, IPA /ˈθrɪmr̩/), or Saturn XXX, is a natural satellite of Saturn. It was discovered by Gladman, et al. in 2000, and given the temporary designation S/2000 S 7. Thrymr is about 5.6 kilometres in diameter, and orbits Saturn at an average distance of 20,810 Mm in 1120.809 days, at an inclination of 175° to the ecliptic (159° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.453.

Thrymr may have formed from debris knocked off of Phoebe at some point in the past.

Its name comes from Norse mythology, where Thrym is a Jotun or frost giant.

The name was announced as Thrym in IAU Circular 8177. However, the IAU Working Group on Planetary System Nomenclature later decided to add the nominative case ending -r to the root Thrym.

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