Both are correct. On this website, for reasons mostly arbitrary (and also slightly aesthetic and pretentious), I will use the British spelling, theatre, unless referring to a specific theatre company, which may spell its name theater, as in Silverthorne Theater Company. In general, though, the word theatre, as it refers to a concept or an art form will be spelled -re. Any inconsistencies regarding this convention are, of course, my own error.
Theatre vs Theater
Published by Theodor Gabriel
Theodor Gabriel is a producer and dramaturg finishing his MFA in Dramaturgy at Columbia in New York City. He has worked as a freelance creative producer, dramaturg, and performer in Berlin (Germany), Western Massachusetts, and New York City. Before Columbia, he served as Associate Producer of Daniel’s Art Party, a festival of theatrical events which took place at Bard College at Simon’s Rock, where he'd received his B.A. in Theatre and Literature in 2016. He is also a graduate of the National Theater Institute Semester (2014) and of the London Dramatic Academy (2015). View more posts