Jan Olis was a Dutch Golden Age painter.
Olis was born in Gorinchem. According to the RKD in 1632 he became a member of the Dordrecht Guild of St. Luke. In 1637 he got married, and during the years 1632-1643 he is registered both as a wine seller and a teacher in the guild. He is possibly the same person as Jan Olofsen who became a member of the Confrerie Pictura in The Hague in 1643. He then moved to Heusden in 1651 where he had various positions in the council until he became a mayor there in 1657 and was tax collector in 1670. He is known for farm scenes, genre works, and merry companies and influenced the painter Mathieu Lenain. He died in