Tack may refer to:

• Tack, a type of cut nail, used in upholstery, shoe making and saddle manufacture
• Horse tack, harness and equipment to allow horse-back riding
• Tack (sewing) (also baste or pin), quick, temporary stitching intended to be removed
• Hardtack, a hard cracker or biscuit used for food on sea voyages and during the American Civil War
• Thumbtack or drawing pin, a short nail or pin easily placed and removed by hand
• In sailing:
  • Tacking, a manoeuvre by which a sailing boat turns its bow through the wind
  • Tack (sailing), the lower corner of a sail's leading edge
  • Tack (square sail), a type of rigging unique to square sails

Tack can also mean:

• Adhesiveness, a technical measure of the stickiness of glue or ink (measured by an "inkometer")
• Blu-Tack, a reusable putty-like pressure-sensitive adhesive used for attaching paper items to walls
• "Tack" or "tacky" refers to cheap goods, and possibly derives from poor quality stitching which causes the goods to fall apart prematurely
• Slang for cannabis

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