Abstract: A locking device (20) for locking an umbrella (503) to a table includes an umbrella pole-receiving sleeve (22) having a first hole (24), a pin-receiving sleeve (28) perpendicularly connected to the umbrella pole-receiving sleeve (22) so that pin-receiving sleeve (28) is axially aligned with first hole (24). The pin-receiving sleeve (28) has two contrapositioned holes (32 and (34) which are sized to receive the shackle of a conventional lock (500). A pin (36) is slidably received by pin-receiving sleeve (28) and the first hole (24). Locking device (20) is placed around the pole (502) of the umbrella (503) in a location below the table top (506). Pin 36 is aligned with and inserted into a thruhole (504) in pole (502). A conventional lock (500) is then used to hold pin (36) in place within thruhole (504) thereby locking locking device (20) around the pole (502). Since locking device (20) is larger than the pole-receiving hole in table top (506), umbrella (503) cannot be removed from the table.