The 21st century of the Christian or Common Era, which runs from 2001 through 2100.

21st century may also refer to:

Media

• Twenty-First Century, a Hong Kong intellectual journal influential in China during the early 1990s
• The 21st Century, an American television news show hosted by Walter Cronkite, originally called The 20th Century
• 21st Century Fox, an American mass-media conglomerate acquired by Disney

Music

• 21st Century (band)
• 21st Century (Blue System album), 1994
• 21st Century (Groove Coverage album), 2006
• 21st Century, an album by Lincoln Thompson, 1997
• "21st Century (Digital Boy)", a song by Bad Religion, 1990
• "21st Century", a song by Red Hot Chili Peppers from Stadium Arcadium, 2006
• "21st Century Boy", a song by Sigue Sigue Sputnik, 1986

Business

• 21st Century Network (21CN), a networking project by BT Group plc
• 21st Century Insurance, a subsidiary of Farmers Insurance Group

See also

• 21st century BC
• Century 21 (disambiguation)
• Siglo XXI (disambiguation)