Abstract: An apparatus (10) for preventing theft of riding saddles (12) includes a one-piece, rigid lock device (34) and a padlock (36). The lock device (34) is formed by a finished steel rod having one end bent into a circular shape to form a ring (40) having an extension (42) integrally secured and extending therefrom. The ring (40) is of a size for placement around the saddle horn (16) and for abutment with the saddle body (14). The extension (42) extends through the opening (20) in the saddle body (14) when the ring (40) is received on the saddle horn (16) and adjacent to a bar (28) of a saddle rack (22). A series of apertures (44) are formed in the extension (42) for slideable receipt of the legs of the clasp (38) of the padlock (36). Additionally, the clasp (38) of the padlock (36) extends around the bar (28) of the saddle rack (22) to anchor the lock device (34) to the saddle rack (22).