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:
“Buz, quoth the blue fly,
Hum, quoth the bee,
Buz and hum they cry,
And so do we:
In his ear, in his nose, thus, do you see?
He ate the dormouse, else it was he.”
—Ben Jonson (1572–1637)
“Well, on the official record you’re my son. But on this post you’re just another trooper. You heard me tell the recruits what I need from them. Twice that I will expect from you.... You’ve chosen my way of life. I hope you have the guts enough to endure it. But put outa your mind any romantic ideas that it’s a way to glory. It’s a life of suffering and of hardship and uncompromising devotion to your oath and your duty.”
—James Kevin McGuinness, and John Ford. Lt. Col. Kirby Yorke (John Wayne)