Plane may refer to:

• An Aeroplane or airplane, a type of fixed-wing aircraft.
• A mathematical plane, a theoretical surface which has infinite width and length, zero thickness, and zero curvature.
• Plane, trees of the genus Platanus native in the Northern Hemisphere but also widely planted elsewhere, particularly in urban areas.
• Plane (tool), a woodworking tool for flattening surfaces.
  • Planing, the use of this tool.
• Plane (cosmology), a theoretical region beyond the known universe, or the region containing the universe itself, by association with mathematical conceptualizations of dimensions.
  • Plane (Dungeons & Dragons), a plane of existence in the role-playing game Dungeons & Dragons.
• Planing, in sailing, is a method of travelling quickly across water by using speed to lift the hull out of the water.
• Plane River in Germany

See also plain.