21st century may refer to

• The 21st century of the Christian or common era that runs from 2001-2100
• 21st century (album) by reggae artist Lincoln Thompson, released in 1997
• 21st Century (song), a song by rock band Red Hot Chili Peppers from their 2006 album Stadium Arcadium
• 21st Century (Digital Boy), a song by Bad Religion
• 21st Century Network (21CN), a networking project by BT Group plc.
• The 21st Century with Daljit
• 21st Century Insurance, a division of AIG

The 21st Century was also a tv news show hosted by Walter Cronkite back in the mid 1960's.

20XX may refer to:

• an unspecified date between the years 2000 and 2099 inclusive.
• The video game Seven Samurai 20XX.

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