Poronin [pɔˈrɔnin], is a village in southern Poland; from 1999 it formed part of Tatra County of the Lesser Poland Voivodeship (it was previously in Nowy Sącz Voivodeship from 1975 to 1998). It lies approximately 7 kilometres (4 mi) north-east of Zakopane and 80 km (50 mi) south of the regional capital Kraków.

Poronin sits on the confluence of rivers Zakopianka [pl] and Poroniec [pl], which gives rise to the river Biały Dunajec.

In the summers of 1913 and 1914 Vladimir Lenin and Nadezhda Krupskaya rented a holiday home in nearby Biały Dunajec and often stayed in a Poronin inn. The area formed part of Austria-Hungary at that time (as a result of the Partitions of Poland), and when World War I broke out in mid-1914 the Austrian authorities arrested Lenin on suspicion of spying for Russia (August 1914), but deported him to Switzerland soon after (September 1914).

During 1947-1990 there used to be a Lenin Museum in Poronin [pl] and a statue of Lenin. The statue was transferred to the Socialist Realism Art Gallery (Polish: Galeria Sztuki Socrealizmu, also known as the "Museum of Socialist Realism") in the Kozłówka Palace complex in the Lublin Voivodeship.