TOI-1266 is a cool M-dwarf (about 0.44 solar masses, 3,563 K, 0.42 solar radii), 36.0 light-years from Earth. TOI-1266 b is a 4.5-Earth-mass planet, with an orbital period of 10.9 days, at 0.073 AU from its star, and an equilibrium temperature near 415 K, discovered in 2020 via transit. TOI-1266 c is a 3.2-Earth-mass planet, with an orbital period of 18.8 days, at 0.105 AU from its star, and an equilibrium temperature near 346 K, on an eccentric orbit (e ≈ 0.07), discovered in 2020 via transit.