Gap is a synonym for any hole or opening; a chasm. Many uses of the word are either literally or figuratively based on this meaning.

Gap may mean:

• Gap (landform), a way through high land, often carved by a river
  • Seismic gap
• Gap (clothing retailer), a company in the United States
• gallium phosphide, "GaP", a semiconductor material
• In ecology, a gap refers to the spacing between large trees in a forest.

A place:

• Gap, Hautes-Alpes, a town in France, in the Hautes-Alpes département
• Gap, Pennsylvania, United States
• The Gap, Queensland, a suburb of Brisbane, Queensland, Australia
• The Gap, Mount Isa, Queensland, a suburb of Mount Isa, Queensland, Australia
• The Gap, a pass at the south end of Hut Point Peninsula, on Ross Island, Antarctica
• The Gap, a spectacular ocean cliff at Watsons Bay, New South Wales, Australia
• The Gap slang for the province between Alberta and Manitoba: Saskatchewan, Canada
• Loughborough Gap, a disused section of the Great Central Railway in Loughborough, England