(44594) 1999 OX3 is an eccentric trans-Neptunian object with a centaur-like orbit from the outer Solar System, approximately 150 kilometers in diameter.

[3] It was discovered on 21 July 1999, by astronomers John Kavelaars, Brett Gladman, Matthew Holman and Jean-Marc Petit at Mauna Kea Observatories, Hawaii, United States.

[5] 1999 OX3 orbits the Sun at a distance of 17.6–46.6 AU once every 181 years and 9 months (66,375 days).

The Deep Ecliptic Survey (DES) defines centaurs using a dynamical classification scheme, based on the behavior of orbital integrations over 10 million years.

Lightcurve analysis gave a rotation period of 9.26 hours with a brightness amplitude of 0.11 magnitude (U=2).