Ozun (Hungarian: Uzon, Hungarian pronunciation: [ˈuzon]; German: Usendorf) is a commune in Covasna County, Transylvania, Romania composed of seven villages: Bicfalău (Bikfalva), Lisnău (Lisznyó), Lisnău-Vale (Lisznyópatak), Lunca Ozunului (Vesszőstelep), Măgheruș (Sepsimagyarós), Ozun, and Sântionlunca (Szentivánlaborfalva).

[4] The settlement formed part of the Székely Land region of the historical Transylvania province.

In August 1940, under the auspices of Nazi Germany, which imposed the Second Vienna Award, Hungary retook the territory of Northern Transylvania (which included Ozun) from Romania.

Towards the end of World War II, however, the commune was taken back from Hungarian and German troops by Romanian and Soviet forces in September 1944.

In 1950, after Communist Romania was established, Ozun became part of the Sfântu Gheorghe Raion of Stalin Region.