UX Orionis is a variable star in the constellation of Orion. It is a Herbig Ae star, located about 1,000 light-years from Earth. At its brightest it is a magnitude 9.5 object, so it is too faint to be seen with the naked eye. UX Orionis is the prototype of the UX Orionis class of variable stars, which are young stellar objects that exhibit large, irregular changes in visual-band brightness. UX Orionis was discovered by Henrietta Swan Leavitt.