1300 Oslo (active from 1979 in Oslo, Norway) was a Norwegian jazz band originally called Oslo 13 (1979-93), founded and operated the first two years by Bror Hagemann and continuated by Jon Balke. In 1994 the band got a joint leadership with Trygve Seim, Morten Halle and Torbjørn Sunde, and changed their name.
The band's first release was the album Anti-therapy (1981). Oslo 13 was awarded Spellemannprisen in 1988 for the album Off balance. The follow up Nonsentration (1992) also was an acclaimed album. The last album from Oslo 13 was a live album from 1992.