Yedisan (also Jedisan or Edisan; Ukrainian: Єдисан, romanized: Yedysan, Romanian: Edisan, Ottoman Turkish: یدیصان, Turkish: Yedisan, Russian: Едисан, romanized: Yedisan, Dobrujan Tatar: Ğedísan) was a conditional name for Özi [Paşa] Sancağı (Ochakiv Sanjak) of Silistra Eyalet, a territory located in today's Southern Ukraine between the Dniester and the Southern Bug (Boh), which was placed by the Ottomans under the control of the Nogai Horde in the 17th and 18th centuries and was named after one of the Nogai Hordes.

In the Russian Empire, it was referred to as Ochakov Oblast, while the Ottoman Turks called it simply Özü after the city of Ochakiv which served as its administrative center.

Geographically, it was the western part of the so-called Wild Fields that sprawled to the north of the Black Sea between the Dniester and Dnieper rivers.

It was also part of a larger nomadic conflict between the Nogais who were clients of the Ottoman Porte and the Russian-sponsored Zaporizhian Cossacks.

Through the 1792 Treaty of Jassy (Iaşi) which concluded the Russo-Turkish War of 1787-1792, the Russian frontier was extended to the Dniester River and the takeover of Yedisan was complete.