The OSO Arts Centre is a 130-seat theatre located in Barnes in the London Borough of Richmond upon Thames.

[1] The building was previously Barnes' postal sorting office, but was redeveloped into a mixture of residential and commercial space with the first residents arriving in 1999.

[3] Some well-known names have performed at the OSO over the years including Patricia Hodge, Timothy West, Stephanie Cole, Julian Glover, Janie Dee, Issy van Randwyck, Harriet Thorpe, Lee Nelson and Robert Pattinson.

[4] The theatre is currently led by Artistic Director Lydia Sax and General Manager Lisa Ross.

During the Covid-19 pandemic in 2020 the theatre space was refurbished as a 'Crisis Kitchen', with the OSO staff and volunteers preparing over 10,000 free meals for the elderly and vulnerable, NHS workers, and those in economic hardship.