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Mikołaj Sieniawski (c. 1489 – 1569) was a notable Polish magnate, military commander and a prominent politician of his times. Since 1539 he served as a Field Hetman of the Crown and took part in most wars Poland was engaged in. Most notably he organized several successful raids to the area of the Ottoman Empire and Crimea. Between 1542 and 1553 he was also the voivode of Belz, and after that time he rose to be a voivod of the Ruthenian Voivodship, one of the richest and most populous regions of the Republic. In 1563 he was promoted to the rank of Grand Crown Hetman, that is the de facto commander in chief of the Polish army.
He is not to be confused with his distant relative Mikołaj Hieronim Sieniawski, who was also a hetman in 1682 and 1683.
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