Snowball is the names of five cats that have been owned by the Simpson family:
- Snowball I, a white female cat who died and only briefly appeared in a flashback in the series, but has been mentioned numerous times.
- Snowball II, a dark gray female cat which was the cat owned from the first episode up until her death in the episode "I, (Annoyed Grunt)-Bot."
- Snowball III, a brown male cat that only appeared in "I D'oh-Bot."
- Coltrane (a.k.a, Snowball IV), a white male cat with hair similar to Bart's that only appeared in "I D'oh-Bot."
- Snowball V, commonly referred to as Snowball II, a dark gray female cat that first appeared in "I D'oh-Bot" and has been the family cat ever since.