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Przemsza
Three Emperors' Corner
Origin	Three Emperors' Corner, Mysłowice 50°13′46″N 19°09′26″E / 50.22944°N 19.15722°E / 50.22944; 19.15722
Mouth	Vistula at Gorzów 50°3′58″N 19°14′0″E / 50.06611°N 19.233333°E / 50.06611; 19.233333Coordinates: 50°3′58″N 19°14′0″E / 50.06611°N 19.233333°E / 50.06611; 19.233333
Basin countries	Poland
Length	24 km (15 mi)
Basin area	2,121 km2 (818.9 sq mi)

Przemsza (German: Przemsa) is a river in the south of Poland, a tributary of the Vistula.

It orginates at the confluence of the Black (Polish: Czarna) Przemsza and White (Biała) Przemsza between the cities of Mysłowice and Jaworzno, and flows about 24 km (15 mi) southwards along the towns of Imielin and Chełmek to its mouth northeast of Oświęcim.

Since the 12th century, the river formed the eastern border of the Silesian Duchy of Racibórz with Lesser Poland. From 1846 on the so-called Three Emperors' Corner at the confluence of Black and White Przemsza marked the tripoint of Prussia, Austria and Russia. Nowadays the lower Przemsza forms the border between Silesian Voivodeship in the west and Lesser Poland Voivodeship in the east.