83 (eighty-three) is the natural number following 82 and preceding 84.

83 is:

• the sum of three consecutive primes (23 + 29 + 31).
• the sum of five consecutive primes (11 + 13 + 17 + 19 + 23).
• the 23rd prime number, following 79 (of which it is also a cousin prime) and preceding 89.
• a Sophie Germain prime.^[1]
• a safe prime.^[2]
• a Chen prime.^[3]
• an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
• a highly cototient number.^[4]
• the number of primes that are right-truncatable.^[5]
• a super-prime, because 23 is prime.

• M83 is the debut album of the French electronic music group M83
• 83 is a song written by John Mayer in the Room for Squares album.
• 83 is a Quebec hip-hop group^{[citation needed]}
• 83 is a song produced by Maximono^{[citation needed]}

• Gypsy 83 is 2001 film directed by Todd Stephens
• Class of '83 is 2004 film directed by Kurt E. Soderling
• 83 Hours 'Til Dawn is a 1990 film directed by Donald Wrye
• 83 is the highest UHF channel on older televisions made before the late 1970s (newer televisions only go up to channel 69, due to the frequency spectrum previously assigned to channels 70–83 in the United States being reassigned to cellular phone service there in the late 1970s-early 1980s). As an example, the television station CIVIC-TV managed by the James Woods character Max Renn in the 1983 film Videodrome was on Channel 83.

Eighty-three is also:

• The year AD 83, 83 BC, or 1983
• The TI-83 series, graphing calculators from Texas Instruments
• Konsept83 is a Greek graphic design team.
• The model number of Bell XP-83
• The number of the French department Var
• The ISBN Group Identifier for books published in Poland
• The eighth letter of the alphabet is H and the third letter is C, thus 83 stands for "Heil Christ," a greeting sometimes (not always) used by racist organizations that consider themselves also to be Christian.^[6] This symbology is also known to be used by many non-racist^[6] Christians and non-denominational Churches.
• An emoticon based on :3 with wide-open eyes.