Abstract: A portable door lock for use in holding closed a door that swings on hinges from an open position to a closed position wherein an edge of the door, opposite its hinged edge, is adjacent to a closure surface with a clearance gap therebetween. The portable door lock comprises a strap secured at one end to an anchor and to an opposite end to a locking member. The strap is positioned with the clearance gap such that the anchor abuts one side of the hinged door and one side of the closure surface. Simultaneously, the locking member is adjustably coupled to the strap at a particular point such that the locking member abuts an opposite side of the hinged door and an opposite side of the closure surface. In such a configuration, the door is held from motion with respect to the adjacent closure surface.