Mercury may refer to many different things:

Science

• Mercury (planet) - in astronomy, the nearest planet to the Sun in the solar system
• Project Mercury - in astronautics, an early American program for launching humans into space
• Mercury (element) - in chemistry, a chemical element
• Mercury (magazine) - a popular astronomy magazine published by the Astronomical Society of the Pacific [1]
• Mercury (computer) - developed in the early 1950's by Ferranti and University of Manchester computing department
• Good King Henry - a species of goosefoot also called mercury or English mercury

Culture

• Mercury (mythology) - a Roman god
• Freddie Mercury - in rock music, a singer from the group Queen
• Mercury Drug - Philippine drug store chain
• Mercury Records - in the music industry, a commercial record label
• The Mercury - a newspaper published in Hobart, Australia
• Mercury dime - a coin preceding the current dime in the United States
• Mercury, France - a commune in the Savoie département of France
• Mercury, Nevada - a "town" in the US State of Nevada
• Mercury, the Winged Messenger - in music, a movement in Gustav Holst's The Planets suite

Technology

• Mercury (automobile) - a marque of automobile produced by the Ford Motor Company
• Bristol Mercury - in aeronautics, a 9-cylinder aircraft engine
• Mercury programming language - in computing, a programming language
• Mercury - SMS Sending Program - a program that sends SMS messages
• Mercury Communications - a now-defunct British telco
• Mercury outboard motors - in boating, a manufacturer of outboard motors
• Mercury memory - in computers, kind of delay line memory, in use in 50's (UNIVAC I)
• Mercury (company) - a software and consulting company