Proxy may refer to something which acts on behalf of something else as in:

• Proxy server, a computer network service that allows clients to make indirect network connections to other network services
• Proxy pattern, a software design pattern in computer programming
• 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 murder, a murder in which the murderer does so at the behest of another
• Proxy voting, one way of casting an absentee ballot in some elections
• Proxy war, a war where two powers use third parties as a substitute for fighting each other directly
• Proxy statement, an announcement of and an invitation to a U.S. stockholders' meeting
• Proxy fight, an event that may occur when opposition develops to a corporation management among its stockholders
• Proxy marriage, a practice formerly common amongst European monarchs, where one party is not present in person to their marriage to the other
• "Proxy", an advanced humanoid character in the anime Ergo Proxy
• Proxy Card- A substitute card used in trading card games when a player does not own the substituted card.
• Proxy (band)- A blues rock band from central Massachusetts consisting of Matt Hedgpeth, Chris Whitehead, and Aaron Faucher.