TOI-5799 is a cool M-dwarf (about 0.33 solar masses, 3,452 K, 0.32 solar radii), 27.8 light-years from Earth. TOI-5799 b is a planet with 1.7 Earth radii, with an orbital period of 4.2 days, at 0.035 AU from its star, and an equilibrium temperature near 505 K, discovered in 2024 via transit. TOI-5799 c is a planet with 1.8 Earth radii, with an orbital period of 14.0 days, at 0.078 AU from its star, and an equilibrium temperature near 337 K, discovered in 2025 via transit.