The hub for an unducted propeller having variable-pitch blades of a turbine engine, comprising two parallel annular side walls between which are arranged rings which are distributed angularly in a regular manner around a longitudinal axis of the hub, which are connected to the annular side walls, and which comprise compartments which are designed to receive bearings having radial axes for guiding in rotation roots of blades of said propeller, said rings being connected in pairs by connection means which are arranged between the annular side walls and which comprise reinforcing partitions which are substantially radial with respect to the longitudinal axis of the hub, wherein at least some of said reinforcing partitions are connected to said annular side walls.