The 20th century of the Common Era began on 1 January 1901 and ended on 31 December 2000, according to the Gregorian calendar.
20th century may also refer to:
- Twentieth Century (play), a Broadway play
- Twentieth Century (film), a 1934 American comedy
- Twentieth Century Pictures, a 1930s film studio
- Twentieth Century (TV series), the 1950s television series
- Twentieth Century (Alabama album), an album by country music group Alabama
- Twentieth Century (typeface), a sans-serif typeface
- 20th Century (album), an album 3X Krazy
- 20th Century Limited, the flagship passenger train of the New York Central Railroad.
- 20th Century Masters - The Millennium Collection, a series of budget-priced compilation CDs
- 20th Century Records, a record label begun as a soundtrack division of Twentieth Century Pictures, later becoming the home of hit R&B acts such as Barry White, Ambrosia, and the DeFranco Family in the 1970s and 1980s
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