Abstract: An adjustable holster securement device comprising a loop attachment for securing the holster to the belt of a user, a connection plate to which a holster can be attached, and an articulated joint for connecting the loop attachment to the connection plate in an articulated manner. The articulated joint comprises two substantially U-shaped members pivotably engaged in respective seatings on opposite sides thereof. The seatings are generally coaxial with parallel to and integral with, respectively, the loop attachment and connection plate. At least one tie-rod is also provided, acting generally parallel to the seatings to connect the substantially U-shaped members to one another and a device for locking the articulated joint arranged between the substantially U-shaped members and the seating, and operable by the tie-rods to control locking and release of the articulated joint.