Non sequitur may refer to:

• Non sequitur (fallacy), an invalid argument whose conclusion is not supported by its premises
• Non sequitur (literary device), an irrelevant, often humorous comment to a preceding topic or statement
• Non Sequitur (comic strip), a comic strip by Wiley Miller
• "Non Sequitur" (Star Trek: Voyager), an episode of Star Trek: Voyager
• Sequitur, a musical project by Karlheinz Essl Jr.

• Sequitur algorithm, a recursive algorithm