Rhiannon is a queen in Welsh mythology.
Rhiannon may also refer to:
Rhiannon (given name), a Welsh given name Lee Rhiannon (born 1951), Australian politician "Rhiannon" (song), a 1975 Fleetwood Mac song Rhiannon: Curse of the Four Branches, a 2008 video adventure game 16912 Rhiannon, an asteroid
See also Rhianna, variant feminine given name