Abstract: A torsion spring door closing apparatus for automatically closing doors with minimal hardware includes a torsion spring having a central coiled portion and a pair of arms. The coiled portion is configured to fit around a shaft of a hinge pin of a door hinge. The pair of arms comprises a hook arm and a catch arm each extending from the coiled portion. The pair of arms moves between a closed position and an open position and the torsion spring is biased towards the open position. When a door opens and squeezes the pair of arms towards the closed position they rebound to force the door to close again. A hook end of the hook is selectively engageable with a catch end of the catch arm to secure the torsion spring in the closed position and disengage the apparatus.