Abstract: A post and beam furniture system includes a plurality of overhead beams, and a plurality of vertical posts having at least one outwardly extending flange with a single slot extending vertically along the end face of the flange. Beam-to-post connectors are attached to the opposite ends of the beams, and are detachably retained in the slots in the posts for mounting the beams on the upper ends of the posts. The furniture system may also include X-shaped posts and Y-shaped posts with slots which create an integrated mounting arrangement for detachably interconnecting the posts and beams in alternative configurations, and mounting accessories at a variety of different locations.