Mikołaj Firlej may refer to several members of the Firlej family:
Mikołaj Firlej (died 1526), hetman, voiode of Sandomierz (wojewoda sandomierski) Mikołaj Firlej (d. 1588), voivode of Lublin (wojewoda lubelski) Mikołaj Firlej (died 1601), voivode of Kraków (wojewoda krakowski), Grand Marshal of the Crown Mikołaj Firlej (1588–1635), voivode of Sandomierz (wojewoda sandomierski)