It was built in 1906 and named after King Oscar II. The opening production was Frihetsbröderna (Les brigands) by Jacques Offenbach, on 6 December the same year. The theatre has during the years been seen as the foremost stage for musical productions and operettas in Sweden. The theatre has 905 seats and for many years in the early 20th century was part of Albert Ranft's theatre empire. Rosa Grünberg worked there.
Over the years it has boasted some great musical productions, including several successful stagings of My Fair Lady (the 1959–61 run reaching 766 performances) and the 1989–95 run of The Phantom of the Opera (performed 1173 times). The original Swedish (and European) staging of Nine in 1983 is also among the most successful – and critically acclaimed – productions in the theatre's history.
The theatre was managed until 1926 by Albert Ranft, from 1926 to 1947 by Gösta Ekman (senior) and Pauline Brunius among others (it was used in this period solely as a stage for spoken drama), and from 1947 to 1998 by Sandrews (this period is often described as the theatre's "golden days" in terms of musical theatre shows).
In the autumn of 2006 the theatre celebrated its 100th jubilee with a colourful production of Singin' in the Rain.
- Oscarsteatern.se (official site - non English)