TOI-1803 is an orange K-type dwarf (about 0.76 solar masses, 4,687 K, 0.71 solar radii), 119 light-years from Earth. TOI-1803 b is a 10.3-Earth-mass planet, with an orbital period of 6.3 days, at 0.060 AU from its star, and an equilibrium temperature near 747 K, discovered in 2025 via transit. TOI-1803 c is a 8.0-Earth-mass planet, with an orbital period of 12.9 days, at 0.097 AU from its star, and an equilibrium temperature near 588 K, discovered in 2025 via transit. Mutual gravitational tugs between the planets can slowly reshape their orbits, preserving clues to the system's assembly.