Rhadamanthus was a just ruler in Greek mythology, son of Zeus and Europa.

Rhadamanthus may also refer to:

38083 Rhadamanthus, a trans-Neptunian object Rhadamanthys Linea, a line feature on Jupiter's moon Europa Rhadamanthus, a genus of plants included in the genus Drimia Rhadamanthus (horse), a British Thoroughbred racehorse