Ruby Miller (born August 1992) is a Welsh racing cyclist from Llantwit Major. She began competing as a triathlete at the age of 10 as her mother was a coach with the Maindy Triathlon club in Cardiff. Miller then began cycling with the Maindy Flyers youth cycling club and was spotted at a cyclo-cross event and selected to ride for the British Cycling's Wales talent team. She raced in the Netherlands in 2007, representing Wales in the Interland track competition. Miller is currently sponsored and riding for Trek. Miller participated as a torchbearer for the 2012 Summer Olympics torch relay.