Phalanx (Greek word from phalangos, meaning "line of battle") can refer to:

• phalanx formation in ancient warfare.
• In anatomy, phalanx bones refer to a row of finger or toe bones.
• Phalanx CIWS is a naval defense system.
• The Phalanx are a fictional species of villainous mechanical aliens in Marvel Comics' X-Men comic books.
• Phalanx is also a space-shooter video game.
• Phalanx art school was a private art school around 1900 located in Munich