Gonnoi (Greek: Γόννοι, before 1927: Δερελί - Dereli[2]) is a former municipality in the Larissa regional unit, Thessaly, Greece.

[4] The municipality was created under the Kapodistrias Law in 1997 out of the former communes of Gonnoi, Kallipefki, Itea and Elaia.

About 2 kilometres (1.2 mi) southeast of the town lies the site of the ancient city of Gonnus,[5] after which the present town is named.

The municipal unit Gonnoi is subdivided into the following communities (constituent villages in brackets): The ancient city of Gonnoi was situated in a hillside near the contemporary Gonnoi, now called "Kastri" (i.e. castle).

The area was consecutively ruled by the Kingdom of Macedonia, the Roman, the Byzantine and the Ottoman Empires.