Abstract: The present invention is a portable door lock which comprises a bracket having a protrusion capable of insertion into a lock chamber of a doorframe. The bracket is connected by means of a hinge to a threaded bolt, upon which a hinged brace is slidably mounted. The hinged brace comprises a first member, which is adapted to be pressed against the door, pivotally connected to a second member, which is adapted to be pressed against the doorframe. A spring is mounted upon the first member and engages the second member, urging the second member away from the first member. The second member is provided with a stop which engages the first member. A thumbwheel is mounted upon and threadably engages the threaded bolt, effectively retaining the hinged brace upon the threaded bolt.