Nizhyn Okruha (Ukrainian: Ніжинська округа) was an okruha (regional district) in 1923-1930 in northeastern Ukraine. Its administrative centre was located in Nizhyn.
The okruha was created in 1923 as part of the Chernigov Governorate. In 1925-1930 it served as a first-level administrative division within the Ukrainian SSR.
In 1926 okruha consisted of 12 raions.