Knock three times can refer to:
- "Knock Three Times", a 1970 song by Tony Orlando and Dawn
 - Knock Three Times (album), a 1971 album by Billy "Crash" Craddock
 - Knock Three Times, a 1917 novel by Marion St. John Webb
 - Knock Three Times, a 1968 British television serial that featured Hattie Jacques
 - A tap code or secret knock
 
See also
- Knock Knock Knock, a 2002 EP by Hot Hot Heat
 
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