Jan Łaski or Johannes à Lasco 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.
- Occupation
- translator, Bible translator, Catholic priest, humanist
- Position held
- king's secretary at the Polish court
- Citizenship
- Kingdom of Poland
- Born
- 1499
- Died
- January 8, 1560
