AER or Aer may refer to:
Arts, entertainment and media Aer (band), an American band Aer (album), by Nik Bärtsch's band Mobile, 2003 American Economic Review, an academic journal Aer: Memories of Old, a 2017 video game
Businesses and organizations Companies AerCap (NYSE stock symbol AER), an Irish aviation leasing company Advanced Engine Research, a British auto racing engine manufacturer A.E.R. (automobile), a French former car manufacturer AER (motorcycles), a British motorcycle manufacturer
Organizations Action For Economic Reforms, a public-interest research organization in the Philippines Agri-Energy Roundtable, a non-governmental organization accredited by the United Nations Alberta Energy Regulator, a Canadian independent agency Australian Energy Regulator, a regulatory authority Army Emergency Relief, an American charity Assembly of European Regions, an independent network of European Regions Atmospheric and Environmental Research, an American scientific research agency owned by Verisk Analytics
Languages and linguistics Aer language, an Indo-Aryan language of Pakistan Eastern Arrernte language, ISO-639 language code aer aer, Lindsay version of possessive and object Spivak pronouns
Science and technology Aerides (Aer), an orchid genus Apical ectodermal ridge, critical component of vertebrate limb development All-electric range, the driving range of an electric vehicle
Other uses Aër, a liturgical item in the Eastern Orthodox Church Aer (Sendai), a skyscraper in Japan Air (classical element) (Greek: aer), in ancient Greek philosophy Aeronautics at the Summer Olympics, IOC code AER Annual equivalent rate, an interest rate Algoma Eastern Railway, a former Canadian railway in Ontario Sochi International Airport, in Russia, IATA airport code AER
See also Aer Lingus, Irish airline