Abstract: A pedestal seat assembly for supporting a boat seat thereon includes first and second self-biasing locking mechanisms for restricting rotational and longitudinal movement of the boat seat. A base is configured for mounting to a supporting surface and includes a mounting socket therein. A pedestal or extension has its lower end mounted within the socket of the base. The first self-biasing locking mechanism is mounted within the extension and releasably interconnects the extension and the base, such that the extension is restricted from rotational and longitudinal movement within the base. A seat mount has an upper portion configured to fixedly attach a seat thereto, and a lower portion configured to rotatably mount within the upper end of the extension. The lower end of the seat mount can alternatively be mounted within the socket of the base.