A harness is a looped restraint or support. Specifically, it may refer to one of the following harness types:

• Bondage harness
• Child harness
• Climbing harness
• Dog harness
• Pet harness
• Five-point harness
• Horse harness
• Parrot harness
• Safety harness
• Windsurfing harness
• The backpack straps of a breathing apparatus

Harness may also refer to:

• Cable harness
• Test harness, in software testing
• Harness racing, horse racing
• Loom harness, a component of a loom
• Harness, a type of clinch in grappling
• Harness, Arkansas, a ghost town
• Full harness restraints, see belly chain