'You can't come down here! No, sorry, you're going to have to go round by the swivelling staircase, someone's let off Garrotting Gas just along here -'
--Ginny Weasley diverting students from the corridor where Harry was about to break into Umbridge's office
The swivelling staircase is a magically enchanted staircase in Hogwarts. It is located in the vicinity of the Defense Against the Dark Arts teacher’s office on the second floor (OP32).
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Notes
This is the only mention of a swivelling or rotating staircase in canon. The film shows a vast, cavernous hall with numerous rotating staircases, but these don't exist in the books.
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