Theodore is a chipmunk in Alvin and the Chipmunks series. He's the youngest and hungriest member of the chipmunks and his brothers are Alvin and Simon. His chipette counterpart is Eleanor. He and his brothers appeared with Pooh and Tigger in Cartoon All-Stars to the Rescue.
- Theodore was voiced by Ross Bagdasarian, Sr., and now he's voiced by his son's wife, Janice Karman, who also voices all three of the Chipettes. He is also voiced by singer-songwriter Jesse McCartney in the live-action film series.