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R Aurigae ( R Aur) is a Mira variable, a pulsating red giant star in the constellation of Auriga, at a distance of .
In 1862 R Aurigae was found to be a variable star at Bonn Observatory. It was widely observed in the late 19th century and its spectrum was described in 1890. In 1907 it appeared with its variable star designation in Annie Jump Cannon's Second Catalogue of Variable Stars. R Aurigae has an apparent visual magnitude which varies between 6.7 and 13.9 with a period of 450 days. The light curve varies strongly from cycle to cycle, sometimes having a pronounced hump on the ascending branch and usually having rise and fall times approximately equal. The cycle period has oscillated slowly between about 450 and 465 days.
R Aurigae is catalogued as a component of a double star, with the 10th magnitude HD 233095, although the two stars are unrelated.
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