Mikołaj Jan Prażmowski (1617 – 15 April 1673) was the archbishop of Gniezno and primate of Poland from 1666.

[1] He was born in Prażmów.

[2] He was bishop of Łuck from 1659, and bishop of Warmia from 1664.

He was previously chancellor in 1658-1666 Grand Crown Secretary, Crown Deputy Chancellors from 1658, Grand Secretary of the Crown, Grand Secretary of the Crown from 1652.

[3] He died in Ujazdów