Abstract: An adjustable door stop that enables a hinged door to be propped open at any desired angle relative to the frame to which the door is mounted. Alternatively, the device enables a door to be securely closed, thereby operating as a lock. The device comprises a substantially cylinder-like structure placed over or otherwise mounted to a door hinge. An arcuate inner chamber is disposed and freely moves within the substantially hollow interior of an arcuate outer chamber. Various angular orientations are obtained by selectively aligning the inner chamber with the outer chamber. The chambers are held in their respective positions by activating a locking member disposed on the door stop.