Kleines Theater, Heritage theatre in Bad Godesberg, Germany.

Kleines Theater is a theatre building in the Kurpark area of Bad Godesberg located at Koblenzer Straße 78. The structure displays classical architectural features and provides 161 seats for performances.

The building was designed by local architect Willy Maß and erected in 1922/23 as a residence for the Gebr. David banking house. In 1925 the municipality of Godesberg bought it to house its mayor: Josef Zander lived here from 1926 until his term ended in 1933, followed by the NSDAP mayor Heinrich Alef, from whose office the roughly 70 visits of Adolf Hitler to the Hotel Dreesen were organised. In 1969 the city council made it available to the Kleine Theater, founded on 21 October 1958 in the Ubierstraße; after conversion, the first premiere followed on 18 September 1970.

The theatre was founded on 21 October 1958 by Walter Ullrich in a cellar on Ubierstraße; he was 27, then Germany's youngest theatre director. Lilian Harvey played her last role here in Agatha Christie's "Das Spinnennetz". Since 2019 Frank Oppermann has run the house, keeping Ullrich's mix of acting, comedies and musicals, with summer concerts on an outdoor stage.

The theatre sits in the Kurpark at Koblenzer Straße 78 in Alt-Godesberg, in the former mayor's residence; the entrance is reached on foot through the park. The hall holds 161 seats and the house plays up to 300 performances a season, so booking ahead is advisable. The building belongs to the city of Bonn and is rented to the theatre.

Walter Ullrich founded the theatre on 21 October 1958 in a cellar on Ubierstraße, aged 27 the youngest theatre director in Germany. He led it for 61 years, the longest-serving intendant in the country, and staged Lilian Harvey's last role in Agatha Christie's "Das Spinnennetz".