HD 100546 b is a gas giant exoplanet that orbits a B-type star. Its mass is not well defined; it takes 249.2 years to complete one orbit of its star, and is 53.0 AU from its star. Its discovery was announced in 2014.

HD 100546 b's mass is not well defined. The planet was detected by direct imaging and only has a published radius (6.9 times the radius of Jupiter). The mass is calculated from a Mass-Radius relationship that is not well calibrated for planets that are significantly larger than Jupiter. The planet orbits a young star (and hence the planet is young).