Suggestions by @peckett96

Catherine O'Hara

as Sybil Trelawney in If Harry Potter was set in America

Jackie Earle Haley

as Peter Pettigrew in If Harry Potter was set in America

Matthew McConaughey

as Remus Lupin in If Harry Potter was set in America

Johnny Depp

as Sirius Black in If Harry Potter was set in America

Alan Tudyk

as Arthur Weasley in If Harry Potter was set in America

Robert Redford

as Cornelius Fudge in If Harry Potter was set in America

Lee Pace

as Lucius Malfoy in If Harry Potter was set in America

Jon Hamm

as Lucius Malfoy in If Harry Potter was set in America

Chris Evans

as Gilderoy Lockhart in If Harry Potter was set in America

Martin Short

as Peeves in If Harry Potter was set in America

Molly Ringwald

as Lily Potter in If Harry Potter was set in America

Rob Lowe

as James Potter in If Harry Potter was set in America

Julianne Nicholson

as Molly Weasley in If Harry Potter was set in America

Jamie Lee Curtis

as Rolanda Hooch in If Harry Potter was set in America

Chevy Chase

as Nearly Headless Nick in If Harry Potter was set in America

Chevy Chase

as Nearly Headless Nick in If Harry Potter was set in America

Steve Buscemi

as Argus Filch in If Harry Potter was set in America

Willem Dafoe

as Garrick Ollivander in If Harry Potter was set in America

Crispin Glover

as Quirinus Quirrell in If Harry Potter was set in America

Vera Farmiga

as Petunia Dursley in If Harry Potter was set in America