Abstract: A retractable surfboard leash assembly including means for adjusting the exposed length thereof between the surfboard and the surfboard rider including an elongated, flexible leash defined by spaced-apart first and second distal ends, a housing forming an enclosed volume therein, a shaft centrally mounted in the housing; a spool pivotally mounted on the shaft inside said housing to which the first distal end of the leash is attached and a device provided in the enclosed volume to wind a length of the leash thereupon in an orderly fashion, a spring attached to the spool for winding and simultaneously storing potential energy when the leash is pulled from the housing, through an aperture formed therein, and unwinding and simultaneously releasing the stored potential energy when the leash is released to re-enter the housing for winding and storing therein, a cuff for attaching the housing to the surfboard rider and a device on the surfboard for attaching the second distal end of the leash, and diffuser device at