Ubar

Ubar may refer to:
 * Ab Bar
 * A legendary land in southern Arabia, often referred to as Atlantis of the Sands, which is considered by some to be the same as:
 * Iram of the Pillars
 * Archaeological site of Shisr
 * The Wabar or Ubar craters, near the lost Arabian city
 * U bar, a letter of the Latin alphabet, thats formed from U with the addition of a bar: Ʉ, ʉ.
 * μbar, a unit of pressure