Oppsal Idrettsforening (founded on 4 August 1912 as Bryn Atletklubb) is a multi-sports club from Oslo, Norway. The club has sections for basketball, football, handball, ice hockey, cross-country skiing, athletics and orienteering.

The club's home ground is Trasop. Trasop consists of a combined athletics and football field (grass), as well as a gravel field and an artificial turf field. The handball section has their home matches in Oppsal Arena.

Oppsal Idrettsforening is the result of several mergers. Bryn Atletklubb is the very oldest predecessor, so the date this club was founded, 4 August 1912, is considered the club's foundation date.

• Bryn Atletklubb (founded on 4 August 1912) and Bryn Sportsklubb (founded in autumn 1912) merged in 1914 to form Bryn Sport- og Atletklubb, but this name was changed in 1925 to Bryn Idrettsforening.
• Bryn Sportsklubb merged on 4 September 1927 with Oppsal Sportsklubb (founded on 10 August 1915) and Ulven Idrettsforening (founded on 1 July 1916). Together they formed Idrettsforeningen Bjart.
• Bjart joined forces in 1945 with Idrettsforeningen Freidig (founded on 15 June 1928) and Ulven Idrettsforening (founded on 22 June 1913). The association took the name Idrettsforeningen B.F.G..
• B.F.G. merged on 1 January 1970 with Oppsal Idrettsforening (founded 1 July 1940) and Trasop Ishockeyklubb (founded 6 January 1965). The result of the merger was Oppsal Idrettsforening. On 9 November 2005, the club changed this name to Oppsal Alliance-Idrettsforening.

The history of the handball section goes a long time back. The men's team was dominant in the domestic competitions in the 1970s, and qualified for European participation 9 times. In recent years, the women's team are the section's flagship. The women's team recently gained promotion to REMA 1000-ligaen after a season on level 2 in Norwegian handball.

Quick Facts Full name, Founded ...

Oppsal IF Fotball

Full name	Oppsal Idrettsforening Fotball
Founded	June 1, 1946; 77 years ago (1946-06-01)
Ground	Trasop Idrettspark
League	3. divisjon
2023	3. divisjon, 5th of 14[1]
Website	Club website
Home colours

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The men's association football team currently compete in the 3. divisjon, the fourth tier of the Norwegian football league system, after being relegated from the 2019 2. divisjon.