The Woodstock Opera House is a historical venue for performing arts and receptions located in Woodstock, Illinois. It was designed as a multi-use facility including City Hall, and the police and fire departments by architect Smith Hoag and built by contractor Simon Brink in 1889 for a cost of $25,000. Artists who have performed there include Orson Welles, to whom the stage was dedicated in 2013.

The construction materials are mostly of local origin including lime-stone, terra cotta, fieldstone, white brick and sandstone. Its architectural style is a mixture of late Victorian-era tastes combined with Early American, Midwestern, Gothic and even Moorish elements. The interior is modeled after the showboats of the time, with dimensions and decorations that imitate many of those grand floating theatres.

Today, the Opera House is a fully modernized theatre while retaining its historical character. It features contemporary sound, lighting, stage rigging, heating, air-conditioning and other amenities and is owned and operated by the City of Woodstock