Mikołaj may refer to:

In Polish nobility:

• Mikołaj "the Black" Radziwiłł, noble of the Grand Duchy of Lithuania, Palatine of Vilnius, and Grand Chancellor of Lithuania
• Mikołaj "the Red" Radziwiłł, Polish-Lithuanian lord, Palatine of Vilnius, Grand Chancellor, and Grand Hetman of Lithuania
• Mikołaj VII Radziwiłł, Polish-Lithuanian lord, and Lord Grand Chamberlain of Lithuania
• Mikołaj Firlej (?-1526), Polish nobleman, Hetman, diplomat, and expert of south-east Europe
• Mikołaj Kamieniecki, Polish nobleman and the first Grand Hetman of the Crown
• Mikołaj Krzysztof "the Orphan" Radziwiłł, Polish-Lithuanian lord
• Mikołaj Mielecki, Polish nobleman and politician
• Mikołaj Ostroróg, Polish nobleman
• Mikołaj Potocki, member of the Polish nobility, magnate, and the Field Hetman of the Crown
• Mikołaj Sienicki, notable member of the landed nobility of the Kingdom of Poland
• Mikołaj Szyszkowski, bishop of Warmia from 1633 til his death in 1643
• Mikołaj Zebrzydowski, Palatine of Lublin, Grand Marshal of the Crown, and Palatine of Kraków

In Polish music:

• Mikołaj Gomółka, Polish composer
• Mikołaj Radomski, Polish composer
• Mikołaj Zieleński, Polish composer

In Polish literature:

• Mikołaj Hussowski, Polish Renaissance writer
• Mikołaj Rej, one of the best known Polish poets and writers of the Renaissance

In other fields:

• Mikołaj Sieniawski, notable Polish magnate, military commander, and prominent politician
• Mikołaj Trąba, Polish Roman Catholic priest, Royal Notary, Deputy Chancellor of the Crown, bishop of Halicz, and archbishop of Gniezno

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