A list of schools on TV, their mascot names and principal if known.
I will start with-
South Park Elementary…The Cows…Principal Victoria
Walt Whitman High School, unknown, Mr. Kaufman (“Room 222”)
Sunnydale High, Razorbacks, various (Flutie, Snyder, Wood) (Buffy)
Degrassi Junior High - unknown - Mr. Lawrence
Carver High School, never mentioned, Principal Jim Willis (The White Shadow)
Wossamotta U., unknown, coach Rocky Canute
Bayside High - Tigers - Mr. Belding (Saved by the Bell)
William Penn Academy - The Quakers - John Glascott (The Goldbergs, Schooled)*
*William Penn Academy is a real school, and John Glascott is a real person who really was (is?) the principal there. However, its, and his, portrayal on TV is fictionalized.
James Buchanan High School-Welcome Back Kotter
Smallville High, Crows, various (Kwan, Gibbons, Reynolds) (Smallville, natch)
University of Los Angeles - Fresh Prince of Bel-Air
If we’re doing colleges and universities as well, Undeclared was set at the University of Northeastern California and multiple episodes of Law & Order involve Hudson University in New York City.
Nitpick: The current principal is PC Principal.
Vice Principals: North Jackson High / Warriors & Tigers / Dr. Belinda Brown
Michael Woodman, originally VP, later became principal.
Winslow High School - Principal Steven Harper - Boston Public.
Neptune High / Polly the Parrot / Mr. Van Clemmons – Veronica Mars
Santo Domingo HS…Flamingos…Grace Musso (thumb swish) - Parker Lewis Can’t Lose
Ocean Park High…unknown…Ed Rooney - Ferris Bueller
NM-ninja’d