Ferengi space was the area of space governed by the Ferengi Alliance.

In 2370, in response to Captain Jean-Luc Picard's claim of self-defense in firing upon DaiMon Bok's son, Bok retorted that the Stargazer had been in Ferengi space at the time. Picard explained that he hadn't realized that fact at the time, and that if Bok's son had told him where he was, he would have withdrawn. (TNG: "Bloodlines")