Thread may refer to:

• A kind of thin yarn, thin fibers spun together, for textiles and sewing
• Screw thread, which turns rotation into linear movement, by a ridge running in a spiral down the length of a cylinder
• Topic thread, a string of consecutive message postings to a newsgroup, mailing list or Internet forum
• Thread (computer science), a sequence of instructions which may execute in parallel with other threads
• Threads, a 1984 BBC docudrama concerning the after-effects of a nuclear attack on Sheffield
• Thread (Pern), a destructive mindless alien spore in the Dragonriders of Pern series of science fiction novels
• Threads (Stargate SG-1), a Season 8 Stargate SG-1 episode

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