Abstract: There is described a fixing system for electrical connectors of the type comprising at least one male element (10) and at least one corresponding female element (12) suitable for being reciprocally connected for making an electrical connection. On the outer sheath of one of the two elements (10) or (12) there are provided one or more appendages (24) adapted for the insertion of at least one threaded fixing element (26), whereas on the outer sheath of the opposite element there are provided one or more holes (28) adapted for the introduction of the stem of each fixing element (26). The threaded portion of each fixing element (26) engages with at least one plate (30) of varied shape, provided with a substantially central threaded hole (32) that arranges in coaxial position relative to each hole (28) when the plate (30) is mounted in rotation-prevented operating position.