Planar is an adjective meaning "relating to a plane (geometry)".

Planar may also refer to:

• Planar (computer graphics), computer graphics pixel information from several bitplanes
• Planar (transmission line technologies), transmission lines with flat conductors
• Planar, the structure resulting from the planar process used in the manufacture of semiconductor devices, such as planar transistors
• Planar graph, graph that can be drawn in the plane so that no edges cross
• Planar mechanism, a system of parts whose motion is constrained to a two-dimensional plane
• Planar Systems, an Oregon-headquartered manufacturer of digital displays
• Zeiss Planar, photographic lens designed by Paul Rudolph at Carl Zeiss in 1896

• List of planar symmetry groups
• Planarity, a computer puzzle game
• Plane (disambiguation)
• Planer (disambiguation)
• All pages with titles containing Planar