Oleksander Viktorovych Osetsky (Ukrainian: Олександр Вікторович Осецький; Russian: Александр Викторович Осецкий; 24 June 1873 – 16 February 1937) was a Russian and Ukrainian military officer.

A general in the Imperial Russian Army, after the Russian Revolution he joined the army of the Ukrainian People's Republic (UNR).

From 1914 to 1918, during the First World War, he served in and commanded a regiment in the Imperial Russian Army and reached the rank of major general.

When the Russian Revolution broke out in 1917, he joined the UNR Army.

From December 1918 to January 1919 he was minister of defense of the Ukrainian People's Republic, and then the UNR Army otaman.