HD 155918 is a Sun-like G-type star (about 1.03 solar masses, 5,772 K), 27.6 light-years from Earth. HD 155918 b is a 7.6-Earth-mass planet, with an orbital period of 1.9 days, at 0.030 AU from its star, on an eccentric orbit (e ≈ 0.19), discovered in 2022 via radial velocity. HD 155918 c is a 5.91-Jupiter-mass companion, with an orbital period of 47.1 years, at 13.2 AU from its star, on an eccentric orbit (e ≈ 0.07), discovered in 2022 via radial velocity. Mutual gravitational tugs between the planets can slowly reshape their orbits, preserving clues to the system's assembly.