Am is the present-tense, first-person, singular form of the verb "to be", the copula of the English language.

In German, am is a contraction for the preposition and definite article "an dem". It is used in place names, similar to the English "upon", as in "Frankfurt am Main".

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When used as abbreviations, A.M., AM, Am, and am may refer to:

Electrical engineering

• Amplitude modulation (AM), a modulation technique used primarily to transmit speech at radio frequencies (see AM radio)

Science

• Attometre (am), an SI measure of length (see orders of magnitude (length) for a list of objects on this scale)
• the chemical symbol for Americium (Am)

Computing

• the country-code top-level domain for Armenia (.am)
• a complexity class (AM) in computational complexity theory (see Arthur-Merlin protocol)
• an artificial intelligence program by Doug Lenat
• an abbreviation for away message

Politics

• in the United Kingdom, post-nominal letters signifying membership of the National Assembly for Wales or the London Assembly
• in Australia, post-nominal letters signifying a Member of the Order of Australia

Other

• Ante Meridiem (A.M. and AM), Latin for "before noon", used to disambiguate hours of the day when using the 12-hour clock system
• Anno Mundi, Latin for "in the year of the world" (see Anno Domini)
• Anno Martyrum, Latin for "in the year of the martyrs", used in the Coptic calendar
• Artium magister , New Latin for Master of Arts
• the ISO 3166-1 alpha-2 country code for Armenia (AM)
• the ISO 639 alpha-2 language code for Amharic (am)
• the International Air Transport Association (IATA) airline designator for Aeromexico (AM)
• the Association of American Railroads (AAR) reporting mark for Arkansas and Missouri Railroad (AM)
• Airmail
• Air Medal
• the malevolent supercomputer in the story I Have No Mouth and I Must Scream
• Internet Slang for away message