Blue John may refer to:
- Derbyshire Blue John, a form of fluorite mined in Derbyshire, England
- Blue John Cavern, a cavern in Castleton, Derbyshire where fluorite is mined
- Blue John Canyon, a canyon in Utah, United States, site of the Aron Ralston accident
- Blue John (album), an album by organist John Patton
- Lance-Constable Bluejohn, a character in the Discworld series, a member of Ankh-Morpork City Watch
- Blue John Gap, a fictional location in Arthur Conan Doyle's short story "The Terror of Blue John Gap"
Famous quotes containing the words blue and/or john:
“The modern queer was invented by Tennessee Williams. Brando in blue jeans, sneakers, white T-shirt and leather jacket. When you saw that, you knew they were available.”
—Derek Jarman (b. 1942)
“Despite everybody who has been born and has died, the world has just gone on. I mean, look at Napoleon—but we went right on. Look at Harpo Marx—the world went around, it didn’t stop for a second. It’s sad but true. John Kennedy, right?”
—Bob Dylan [Robert Allen Zimmerman] (b. 1941)