Disclosed is a pet tag holder, namely a device for holding a pet tag on a pet collar. The pet tag holder comprises a planar, inverted "U-shaped" mounting member, for connection to a pet collar, and the mounting member further has two downwardly positioned extension arms in a plane perpendicular to the plane of the mounting member. One of the arms further comprises a post supported on a first mounting member and the other arm comprises a snap fit receptacle for the post on a second mounting member. One arm is fixed in space and the other arm is hinged to permit opening and closing of the post and receptacle. One or more pet tags can be held on the post, and secured to the tag holder when the post is engaged with the snap fit receptacle, the opening of the hinged arm also permits easy movement of the tag holder from one pet collar to another.