Jan Łaski

John à Lasco
Jan Łaski
A copper engraved portrait of Łaski, 1572
Born1499 (1499)
Died8 January 1560(1560-01-08) (aged 60–61)
Pińczów, Sieradz Voivodeship, Crown of the Kingdom of Poland
Other names
  • John Laski
  • Johannes à Lasco
MovementCalvinism
RelativesJan Łaski

Jan Łaski or Johannes à Lasco (1499 – 8 January 1560) was a Polish Calvinist reformer. Owing to his influential work in England (1548–1553) during the English Reformation, he is known to the English-speaking world by the Anglicised form John à Lasco (or less commonly, John Laski).