A cant-wing aircraft is an aircraft concept with variable-angle wings that rotate depending on flight speed. At low speeds, the wings will remain parallel to the fuselage for optimal lift and stability; while at high speeds, the wings will rotate diagonally to reduce drag and improve flight efficiency.

The main purpose of this design concept is to reduce problems caused by increased drag during supersonic flight, so that fuel consumption can be reduced while maintaining efficient flight performance. The concept was first proposed by American aerospace engineer Robert T. Jones, and early experiments were conducted with the help of NASA.

Although the design of oblique-wing aircraft is technically very innovative, it suffers from structural complexity and practical operational challenges.