Trostianets Raion () was a raion in Sumy Oblast in Central Ukraine. The administrative center of the raion was the town of Trostianets. The raion was abolished on 18 July 2020 as part of the administrative reform of Ukraine, which reduced the number of raions of Sumy Oblast to five. The last estimate of the raion population was
In March 1930 the Raion was the centre of a quickly defeated pro-Ukrainian anti-Soviet Union revolt.