Proxy may refer to one who or that which acts on behalf of someone or something else, as in:

• Proxy card, a substitute card used in trading card games when a player does not own the substituted card and also can occur when proxy cards are not tradable
• Proxy fight, attempting to influence how company shareholders use their proxy votes
• Proxy marriage, common amongst European monarchs, where one party is not present in person to their marriage to the other
• Proxy murder, a murder which the murderer commits at the behest of another
• Proxy voting, a vote cast on behalf of an absent person
• Proxy war, a war where two powers use third parties as a substitute for fighting each other directly

Technical Terms:

• Proxy (statistics), a measured variable used to infer the value of a variable of interest
• Proxy (climate), a measured variable used to infer the value of a variable of interest in climate research
• Proxy authentication connects one user through another, generally to authenticate through multiple tiers in a computer system.
• Proxy pattern, a software design pattern in computer programming
• Proxy server, a computer network service that allows clients to make indirect network connections to other network services

Proxy may also refer to:

• Proxy (band) , British band formed in 2004
• Proxy, a mysterious humanoid lifeform in the anime Ergo Proxy
• PROXY, a holodroid featured in Star Wars: The Force Unleashed
• "The Proxy", a song by RJD2 on his 2003 album Deadringer
• Proxy statement, an announcement of and an invitation to a U.S. stockholders' meeting