Goethe-Freilichtbühne Porta Westfalica, Open-air theatre in Barkhausen, Porta Westfalica, Germany.

Goethe-Freilichtbühne Porta Westfalica is an amateur open-air stage in the Barkhausen district of Porta Westfalica, set between steep rocks of the Wiehengebirge in a former quarry. Its auditorium seats 644 spectators and has been fully roofed since 2011. The main stage hosts a summer season, while winter productions move to venues such as the Stadttheater Minden and the Kurtheater Bad Oeynhausen.

The theater was founded in 1927 and opened with Friedrich Hebbel's tragedy 'The Nibelungs'. Since then, it has developed into an institution presenting performances continuously over many decades.

Since the 1970s the summer season has paired a children's play on Sunday afternoons with a main evening play on Saturdays, plus special events in and outside the season. The programme alternates between modern and traditional pieces, and between well-known classics and lesser-known works. The venue is run by the Freilichtbühne Porta Westfalica e.V. with roughly 1,000 members.

Summer performances take place on the main stage in the former quarry in Barkhausen, with the main play on Saturday evening and a children's play on Sunday afternoon. In the winter season the company moves to the Stadttheater Minden, the Bürgerzentrum Minden, the Theater am Weingarten Minden and the Kurtheater Bad Oeynhausen. The 644 seats have been fully covered since 2011.

The managing association Freilichtbühne Porta Westfalica e.V. is supported by around one thousand members and operates entirely independently in running the theater. This strong membership base allows the institution to pursue its own artistic vision.