Theatre 80 was an Off-Broadway theater located at 80 St. Mark's Place in the East Village neighborhood of Manhattan in New York City.

It was owned and operated by Lorcan Otway, who restored and renovated the building with his father and opened it as a theater in the 1960s.

Otway also became involved in film restoration, working with studios to discover lost movies and seeking to strike new prints from better elements in order to preserve and exhibit titles in a way that showcased their best quality.

[7][8] Prior to its current status as a cabaret-style theater, the building, which also houses the Museum of the American Gangster, was a nightclub during Prohibition.

[9] The Otways filed for bankruptcy on December 30, 2021, to prevent the sale of the building amid controversy with their mortgage lender.