Personal restraint systems with buckle assemblies for use in vehicles are disclosed herein. In one embodiment, a personal restraint system includes a connector configured to be coupled to a web. The restraint system also includes a buckle assembly configured to releasably retain the connector. In this embodiment, the buckle assembly includes a frame having a locking feature configured to engage a tongue of the connector. The buckle assembly also includes a locking member movably positioned adjacent to the frame that retains the tongue in a locked position. The buckle assembly further includes an actuator that can be actuated by a user to move the tongue out of the locked position.