311 may refer to: * 311 (number), a natural number *

AD 311 __NOTOC__ Year 311 ( CCCXI) was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerius and Maximinus (or, less frequently, year 1064 ''Ab urbe condita''). The denomination 3 ...

, a year of the Julian calendar, in the fourth century AD * 311 BC, a year of the pre-Julian Roman calendar *

311 (band) 311 (pronounced "three eleven") is an American Rock music, rock band from Omaha, Nebraska. The band was formed in 1988 by vocalist and guitarist Nick Hexum, lead guitarist Jim Watson, bassist Aaron "P-Nut" Wills, and drummer Chad Sexton. Wat ...

, an American band ** ''311'' (album), band 311's self-titled album * 311 (DSM-IV), DSM-IV code for "Depressive Disorder Not Otherwise Specified" * 311 Boyz, a teen gang in Las Vegas, Nevada * 311 Claudia, a main-belt asteroid * 3-1-1, the telephone number of local information service operated by some local governments in the United States and Canada * 3-1-1 for Carry-Ons, a procedure enacted by the United States Transportation Security Administration * 311 earthquake, the 2011 Tōhoku earthquake and tsunami off Japan * 311, the area code of a common fictitious telephone number (311-555-2368) used in early Bell System ads and in fiction * For the KKK code '311', see the list of symbols designated by the Anti-Defamation League as hate symbols

See also