Atar (Avestan atar) is the Zoroastrian concept of holy fire, sometimes described in abstract terms as "burning and unburning fire" or "visible and invisible fire" (Mirza, 1987:389).

Atar (, Berber for mountain) is a town in northwestern Mauritania, the capital of the Adrar Region and the main settlement on the Adrar Plateau. It is home to an airport, a museum and a historic mosque, constructed in 1674. In 2013 it had a population of 25,190.

The Australian Tertiary Admission Rank (ATAR) is the primary criterion for entry into most undergraduate-entry university programs in Australia. It was gradually introduced during 2009 and 2010 to replace the Universities Admission Index, Equivalent National Tertiary Entrance Rank and Tertiary Entrance Rank. Queensland still retains its own separate Overall Position system, but will begin using the national ATAR system in 2018.