Abstract: A sign mounting bracket is provided for use with round posts. The sign mounting bracket includes a sign-interfacing surface, a post-interfacing surface and fastener engagement portions that extend outwardly from the sign and post-interfacing surfaces. Each of the fastener engagement portions is provided with slots for the passage of fasteners used to clamp together the post and bracket. The post-interfacing surface includes separate arc sections for interfacing with round posts having different diameters. The bracket is provided with a central bolt hole and an associated bolt head recess for securing the sign to the sign interfacing surface. The sign, bracket and post can be fastened together by use of post fasteners engaged with the fastener engagement portions in combination with a sign fastener engaged with the central bolt hole, or by use of a through bolt engaged with the central hole and a post hole.