Jan Nepomucen Umiński of Cholewa (1778–1851) was a Polish military officer and a brigadier general of the Army of the Duchy of Warsaw.

[1] He joined the Army of the Republic of Poland early in his life and took part in the failed Kościuszko Uprising of 1794 as an adjutant to General Antoni Madaliński.

Taken captive by the Prussians, he was set free after the armistice and joined the French cavalry, where he quickly rose to the rank of Major.

He was soon transferred to the Army of the Duchy of Warsaw, where he served in Poznań as the commanding officer of a cavalry honour guard squadron.

Under close observation by Prussian secret police, Umiński was considered an "incorrigible traitor of the state" and "zealous and criminal chauvinist due to his earlier involvements in Polish patriotic uprisings.

[4] Despite protests by the youth of Poznań and other towns of the Grand Duchy of Posen,[5] Umiński was charged with high treason and conspiracy, and sentenced to 6 years in a prison in Glogau.

[8] Eduard Heinrich von Flottwell ordered a complete blockade of all major roads leading towards Poland and dispatched hundreds of patrols in search of the fugitive, but the pursuit proved fruitless.

Through Siedlnica, Książęcy Las (where Prince Antoni Sułkowski provided him with money), Rawicz, Chwałkowo, Konary, Grąbkowo and Rusko reached the Polish border.

Critical of his superiors, Umiński nevertheless remained in the army until the very end of the uprising, taking part in the lengthy battle of Warsaw.