WW

The letters WW may refer to:

• Bmibaby IATA airline code
• Watson Wyatt Worldwide NYSE identifier
• Winchester and Western Railroad reporting mark
• Waterworks (disambiguation)
• Weather watch
• William H. Webster, a director of the FBI and CIA, referred to in the Kryptos sculpture as "WW"
• Weight Watchers
• White widow
• an abbreviation for whitewater in the International Scale of River Difficulty
• Woodrow Wilson, the 28th President of the United States of America
• Woodwind instrument
• World war, a term for a military conflict affecting the majority of the world
• Writers Workshop in Calcutta, India
• "Wrong word" in proofreading
• the code for Wicklow, Ireland

In entertainment:

• Washington Wizards, an NBA basketball team
• Wayne's World
• The West Wing, a television series
• Wonder Woman
• World Wrestling Entertainment, an organisation whose logo appears as WW
• The Wubbulous World of Dr. Seuss, a television series
• WW (album), a 2005 album by the Norwegian metal group Gehenna

In video games:

• Animal Crossing: Wild World
• The Legend of Zelda: The Wind Waker
• Prince of Persia: Warrior Within
• WarioWare (series)
• Wario World