A bend is a type of knot used to join two lengths of rope. Bends are used in a variety of situations, including climbing, sailing, and securing loads. They are classified based on their ability to be tightened or released, their resistance to slipping, and their strength. Some common types include the sheet bend, the double fisherman's knot, and the double figure-eight bend. Bends allow two ropes to be securely joined together, enabling the combined ropes to support weight or transmit force. It is important to choose the appropriate bend for the specific task at hand, as some may be stronger or more secure than others.

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The common reef knot (square knot) is sometimes mistakenly tied as a bend. When used as a bend rather than a binding knot, the reef knot will capsize under sufficient tension.^[1] For this reason, the reef knot is insecure as a bend and as such is not listed as one.

Employed as a binding knot, to reef and furl sails or to tie up parcels, [the reef knot] is invaluable. But employed as a bend [...], the reef knot is probably responsible for more deaths and injuries than have been caused by the failure of all other knots combined.

— Clifford Ashley, Ashley Book of Knots

• List of knot terminology
• Binding knot
• Rope splicing
• Whipping knot