The Theater an der Wien is a historic theatre in Vienna located on the Left Wienzeile in the Mariahilf district. Completed in 1801, the theatre has hosted the premieres of many celebrated works of theatre, opera, and symphonic music. Since 2006, it has served primarily as an opera house, hosting its own company.

Mariahilf is the 6th municipal district of Vienna, Austria. It is near the center of Vienna and was established as a district in 1850. Mariahilf is a heavily populated urban area with many residential buildings. It has a population of 31,621 within an area of 1.48 square kilometres (0.6 sq mi).