Kepler-103 is a Sun-like G-type star (about 1.21 solar masses, 6,047 K, 1.49 solar radii), 495 light-years from Earth. Kepler-103 b is a 11.7-Earth-mass planet, with an orbital period of 16.0 days, at 0.133 AU from its star, on an eccentric orbit (e ≈ 0.17), discovered in 2014 via transit. Kepler-103 c is a 0.18-Jupiter-mass companion, with an orbital period of 180 days, at 0.668 AU from its star, on an eccentric orbit (e ≈ 0.10), discovered in 2014 via transit. Mutual gravitational tugs between the planets can slowly reshape their orbits, preserving clues to the system's assembly.