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
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