Royal Blue (disambiguation)

Royal blue is a colour.

Royal Blue may also refer to:


 * Royal Blue (train), a passenger train between New York City and Washington, D.C., United States
 * Royal Blue (yacht), a maxi yacht
 * Royal Blue, Tennessee, a community in Campbell County, Tennessee, United States
 * Royal Blue (pigeon), an RAF messenger pigeon of World War II
 * Myscelia cyaniris or royal blue, a brush-footed butterfly of Central and northern South America
 * Orachrysops regalis or royal blue, a butterfly in the family Lycaenidae found in South Africa