South Norway (Norwegian: Sør-Norge, Northern Sami: Lulli-Norga) is the southern and by far most populous half of Norway, consisting of the regions of Western Norway, Eastern Norway, Southern Norway (Agder) and Trøndelag (Central Norway).
South Norway has no administrative functions, and does not constitute a cultural or linguistic region, as opposed to Northern Norway, the northern half of the country. To people from the latter region, citizens hailing from the southern half are known by the exonym "søringer" (southerners). The inhabitants themselves, however, have no common "southern" identity, as they rather identify with the regions they are from and call themselves "vestlendinger" (from Western Norway), "østlendinger" (from Eastern Norway), "sørlendinger" (from Southern Norway) and "trøndere" (from Trøndelag). Practical use of the region mostly applies to purposes such as weather forecasting.
South Norway (Sør-Norge) must not be confused with Southern Norway (Sørlandet), which is a sub-region with a distinct cultural identity limited to the two southern-most counties of Vest-Agder and Aust-Agder, encompassing the historical district of Agder.