Thompson’s Opera House, also known as the Gem Theater, is a small theater building in Pioche, Nevada. The Opera House is a wood frame building built in 1873, attached roughly to the adjoining brick Gem Theater, a 1937 masonry cinema. The theater was built in September 1873 and featured a performance of Pygmalion and Galatea for its opening night, with a cast of professional actors from San Francisco. The Opera House screened its first silent movie in 1915. In 1935 the Opera House was renamed the Gem Theater, but in 1937 a new Gem Theater was built next door expressly for movies.

The Opera House was added to the National Register of Historic Places in 1984. It is one of three 19th century theaters remaining in Nevada.