- The seventeenth letter of the Appendix:Roman script, English alphabet, preceded by P and followed by R.
- The pseudonym of w:Arthur Quiller-Couch, Sir Arthur Quiller-Couch
- Person or being of mysterious or uncertain nature, usually God-like. From Star Trek but may be found elsewhere.
- question or questions
Q and A
the supposed common source of the Gospels of Mark and Luke (from German Quelle, source)
- the Q factor in electronics