The following is a list of all characters seen or mentioned in the British sitcom, The Inbetweeners.
- Carli D'Amato - Simon's love interest.
- Charlotte Hinchcliffe - The most popular girl in school.
- Mark Donovan - The bully, who often picks on Will.
- John - The fat kid.
- Lauren Harris - The new Irish girl.
- Susie - The nerdy girl.
- Samantha - A loud, outspoken DJ.
- David Glover - A boy at the school.
- David - A spotty nerdy kid.
- Rachel - Carli's friend.
- Hannah - A younger girl who fancies Simon.
- Danny - A young boy who is very hard.
- Andrew Cooper - Simon's little brother, who has been seen to outsmart him.
- Alan Cooper - Simon's father.
- Pamela Cooper - Simon's mother.
- Polly McKenzie - Will's attractive mother who several of his classmates have stated their attraction to.
- Katie Sutherland - Neil's attractive sister.
- Kevin Sutherland - Neil's father, who it appears is a closet homosexual.
- Phil Gilbert - The head of Sixth Form.
- John "Paedo" Kennedy - A teacher at Rudge Park Comprehensive who is suspected of being a pedophile, and shows a particular attraction towards Neil.
- Miss Timms - A biology teacher.
- Mr L. Hopkins - The headmaster of Rudge Park Comprehensive.
- Patrice - Simon's French 'greasy' exchange student.
- Chris D'Amato - Carli's little brother whom Simon threw up on.
- Jim - Works at a garage with Wolfie and Steve.
- Wolfie - Works at a garage with Jim and Steve.
- Steve - Works at a garage with Wolfie and Jim.
- Toby - He works at the local newspaper.
- Chloe - Jay's Girlfriend who he seems to have genuine feelings for.
- Dean - a friend of Rachel.
- Adam - A friend of Rachel.
- Tom - Carli's boyfriend.