Purpose: This study was condacted to evaluate and compare  different degrees of labial implant inclination on retention of locator attachments used for two implant retained mandibular overdentures . Materials and Methods:  Four acrylic resin models representing acompletely edentulous mandibular ridges were used. Each model received two implants inserted at canine area bilaterally with different degree of lingual inclination. Group I (control Group) 0⁰, Group II (10⁰), Group III (20⁰), and Group IV (30⁰). The residual ridge and the retromlar regions for each acrylic resin model were covered by auto-polymerized silicon material to simulate the oral mucosa. Four experimental acrylic metal reinforced overdenture were fabricated and connected to the  implants using Locator attachments, Universal Testing Machine was used for measuring initial and final retentive force, The results: Locator transparent, 0⁰ inclination and anterior dislodging recorded the highest retentive forces, while Locator blue 10⁰ inclination and vertical dislodging  recorded the lowest retention values. Conclusions: For majority of groups, inserts, dislodging forces, initial retention recorded significant higher values than final retention. Key word: Overdenture, Locator attachment, retention test.