Books and comics

• Threshold (novel), a 1985 science fiction novel by David R. Palmer
• Threshold (Sara Douglass novel), a 1997 fantasy novel by Sara Douglass
• Threshold, a 2001 science-fiction novel by Caitlín R. Kiernan

Film and television

• Threshold (2003 film)
• Threshold (TV series)
• "Threshold" (Stargate SG-1), an episode of the TV series Stargate SG-1
• "Threshold" (Voyager episode), an episode of the TV series Star Trek: Voyager

Music

• Threshold (band)
• Threshold (HammerFall album)
• Threshold House, a record label created by Coil
• Threshold Records, a record label created by The Moody Blues
• "Threshold," a song by Slayer on the album God Hates Us All

Games

• Threshold (online game)
• Threshold (fictional planet), a planet in the video game Halo

Comics

• Threshold (comics), a comic book character
• Threshold (Doctor Who), an organization in Doctor Who comic strips

Science

• Thresholding (image processing), a method of image segmentation
• Action potential threshold, a concept in neurophysiology
• Lasing threshold, a concept in laser science
• Sensory threshold, a concept in psychology
• Threshold of pain, a sound pressure level

Other meanings

• Election threshold, a concept in voting systems
• Displaced threshold, an aviation term
• The minimum amount to have a particular effect, e.g.:
• The tax-free threshold: the income at which income tax becomes due.
• The income above which pension is accrued.
• The amount from which a different rate applies.
• A narrow entrance.