Theater Osnabrück is a German theater in Osnabrück, Germany. It operates under the auspices of the Städtische Bühnen Osnabrück gGmbH. The primary performance venues are the Theater am Domhof and the emma-theater.
The roots of the company date back to 1771, with theatrical presentations at the Schloss Osnabrück. In 1780, productions shifted to two former aristocratic residences. Albert Lortzing had an official affiliation with the company from 1827 to 1833. In 1832, the city of Osnabrück took over the complex as its first municipal theatre.
From 1905 to 1909, the main theatre was built. On 29 September 1909, Julius Caesar was the first play to be staged at the newly completed theatre.