WC3 may stand for:

• Heart of the Tiger, a 1994 space combat simulation computer and video game
• Reign of Chaos, a 2002 real-time strategy computer game
  • The Frozen Throne, expansion pack to Reign of Chaos
• A common misspelling of W3C, World Wide Web Consortium

• Alexe Gheorghe Tanasescu
• Alexe Gheorghe Tănăsescu
• Alexei A. Efros
• Alexei Aleksandrovich Vasilchenko
• Alexei Aleksandrovich Zhuravlyov
• Alexei Alexeyevich Borovoi
• Alexei Anatolievich Navalny
• Alexei Arapov
• Alexei Arbuzov (general)
• Alexei Argilagos
• Alexei B. Aleksandrov
• Alexei Bartsov
• Alexei Bell
• Alexei Birbin
• Alexei Bogomolov
• Alexei Bolshakov (politician)
• Alexei Bondar
• Alexei Borislavski
• Alexei Borisovich Aleksandrov
• Alexei Bueno
• Alexei Bugaev
• Alexei Chernuschevich
• Alexei Chistyakov
• Alexei Chubukin
• Alexei Coșelev