HD 20781 is an orange K-type dwarf (about 0.70 solar masses, 5,256 K), 36.0 light-years from Earth. HD 20781 b is a 1.9-Earth-mass planet, with an orbital period of 5.3 days, at 0.053 AU from its star, on an eccentric orbit (e ≈ 0.10), discovered in 2019 via radial velocity. HD 20781 c is a 5.3-Earth-mass planet, with an orbital period of 13.9 days, at 0.100 AU from its star, on an eccentric orbit (e ≈ 0.09), discovered in 2019 via radial velocity. With 4 confirmed worlds, HD 20781 is a densely packed system whose resonances, spacing, and formation history are active research topics.