Pornainen (Finnish: [ˈpornɑi̯nen]; Swedish: Borgnäs) is a small municipality of Finland.

It is located in the province of Southern Finland and is part of the Uusimaa region.

The neighboring municipalities are Askola in the east, Mäntsälä in the north, Porvoo in the southeast and Sipoo in the southwest.

It is located 18 kilometres (11 mi) east of the town of Järvenpää.

[5][6] The village of Laukkoski is known as a summer destination for many former celebrities, such as actress Regina Linnanheimo, and writers Mika Waltari and Juhani Aho.