Sarah Bellum—a play on the word cerebellum—may refer to three fictional characters and a nom de plume:
- Sara Bellum, the mayor's assistant in the Cartoon Network series The Powerpuff Girls
- Sara Bellum, a character in the animated television serie Where on Earth Is Carmen Sandiego?
- Sarah Bellum, a scientist in the Walt Disney Company series Darkwing Duck
- Sarah Bellum, the pen name of Garrison Keillor when writing materials for A Prairie Home Companion.