AER or Aer may refer to:

Biology

• Aerides, an orchid genus, abbreviated Aer
• Agranular endoplasmic reticulum, a cell organelle
• Apical ectodermal ridge, critical component of vertebrate limb development
• Albumin Excretion Rate

Finance

• Annual equivalent rate, a notational interest rate
• Average earnings ratio, in stocks
• Administrative expense ratio, a ratio of general and administrative expenses to total revenue

Languages

• Aer language, an Indo-Aryan language of Pakistan
• Eastern Arrernte language, an Arandic dialect cluster of Australia (ISO-639: aer)

Music

• Aer (band), a hip-hop band
• Aer (album), an album by Swiss pianist and composer Nik Bärtsch's band Mobile

Organizations

• A.E.R. (automobile), a French former car manufacturer
• AER (motorcycles), a British motorcycle manufacturer
• Action For Economic Reforms, a public-interest research organization in the Philippines
• Advanced Engine Research, an endurance racing car engine manufacturer
• AerCap, an aircraft lessor (NYSE stock symbol AER)
• Aer Lingus, airline from Ireland
• Agri-Energy Roundtable, a non-governmental organization accredited by the United Nations
• Alberta Energy Regulator
• Algoma Eastern Railway, a former Canadian railway that operated in the province of Ontario
• Annual Equivalent Rate, as used in the UK
• Atmospheric and Environmental Research, an American scientific research agency owned by Verisk Analytics
• Army Emergency Relief
• Assembly of European Regions, an independent network of European Regions
• Australian Energy Regulator

Places

• Aer (Sendai), a skyscraper in Japan
• Sochi International Airport, Russia (IATA airport code)

Publications

• All England Law Reports, covering the court system in England and Wales
• American Economic Review

Religion and mythology

• Aër, a liturgical item in the Greek Orthodox Church
• Air (classical element), in Greek mythology

Other uses

• AER: Memories of Old, a 2017 adventure video game developed by Forgotten Key and published by Daedalic Entertainment
• All-electric range, the driving range of a vehicle using only electrical energy for propulsion

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