|Voiced by||Mona Marshall|
|First Appearance||The List|
Theresa seems to be one of the more innocent fourth graders. An example of this is her lack of sexual knowledge, as shown in "T.M.I." when she asks Randy Marsh "What's a penis?". This is in contrast to most of the fourth grade girls, many of which have been shown talking about certain kinds of sexual topics. She is currently the only known student to wear a vest.
- "What's a penis?"
- "I don't live in a trailer park!"