Se Wsi Testamenti is the first translation of the New Testament in Finnish; it was published in 1548. It was translated by Mikael Agricola, then rector of the Turku Cathedral School and later Bishop of Turku.

Mikael Agricola was a Finnish Lutheran clergyman who became the de facto founder of literary Finnish and a prominent proponent of the Protestant Reformation in Sweden, including Finland, which was a Swedish territory at the time. He is often called the "father of literary Finnish".