Kepler-31 is a Sun-like F-type star (about 1.21 solar masses, 6,340 K, 1.22 solar radii), 1,665 light-years from Earth. Kepler-31 b is a planet with 5.5 Earth radii, with an orbital period of 20.9 days, at 0.160 AU from its star, discovered in 2011 via transit. Kepler-31 c is a 4.70-Jupiter-mass companion, with an orbital period of 42.6 days, at 0.260 AU from its star, discovered in 2011 via transit. Kepler-31 d is a 6.80-Jupiter-mass companion, with an orbital period of 87.6 days, at 0.400 AU from its star, discovered in 2014 via transit.