PU Aurigae is an irregular variable star located in the constellation Auriga. A red giant, it varies by 0.1 magnitude around magnitude 5.64, so it is faintly visible to the naked eye. Located around 590 light-years distant, it shines with a luminosity approximately 1,523 times that of the Sun and has a surface temperature of 3,482 K.

Although the star was first found to be variable by Joel Stebbins and Charles Morse Huffer in 1928, it was not given its variable star designation until 1977.