Ouinhi is a town, arrondissement, and commune in the Zou Department of south-western Benin. The commune covers an area of 483 square kilometres and as of 2013 had a population of 59,381 people. It is bounded on the north-west by the commune of Zagnanado, south-west by the commune of Zogbodomey, south by the commune of Bonou and east by the commune of Adja-Ouèrè. The commune is divided into arrondissements which include Dasso, Ouinhi, and Tohu, comprising 28 villages.