Regent Theatre, Historic theatre in The Octagon, Dunedin, New Zealand.

The Regent Theatre is a performance venue located at The Octagon in Dunedin, originally designed and built to accommodate a large audience. Its interior features ornate baroque-inspired decor with more than 1600 seats arranged throughout the main hall.

The Regent opened on 1 June 1928 as a 2,000-seat cinema, its interior in revived baroque style after Robert Atkinson's 1921 Regent in Brighton, England. James Hodge White supervised the design, which descends from Charles Garnier's Paris Opera. The Otago Theatre Trust bought it in 1973 and adapted it as a live venue; the Dunedin City Council now owns it.

The Regent is run by the Otago Theatre Trust, a charitable body, and depends on community support; the annual Regent 24-hour Book Sale, held every year since 1979, is the largest second-hand book sale in New Zealand. Volunteers sell over 200,000 donated books, most at NZ$1, and the 2024 sale raised a record NZ$114,885.70. Buyers travel from across the country.

The main entrance opens onto The Octagon, opposite the Municipal Chambers and a short walk from the Dunedin Public Art Gallery. The theatre still runs as a cinema during the annual film festivals, so check what is on before travelling. The Regent 24-hour Book Sale, held each March since 2023 at the Edgar Centre in South Dunedin, is a separate ticketed event.

Since 1979 volunteers have run the Regent 24-hour Book Sale, the largest second-hand book sale in New Zealand and reputedly in the Southern Hemisphere, with over 200,000 donated books, most at NZ$1. It moved in 2023 from the theatre to the Edgar Centre and now runs two 12-hour sessions over one March weekend; the 2024 sale raised a record NZ$114,885.70.