Transportation
- Mercury (automobile), produced by the Ford Motor Company from 1938 to 2011
- Mercury (cyclecar), made in 1914
- Mercury (train), run by the New York Central Railroad during 1936-1958
- Bristol Mercury, an airplane engine
- Blackburn Mercury, British airplane made in 1911
- E-6 Mercury, a United States military aircraft
- Miles Mercury, a British aircraft designed during the Second World War
- MV Celebrity Mercury, a cruise ship built in 1997
- Project Mercury, the first human spaceflight program of the United States
- HMS Mercury, any of several ships of the Royal Navy
- USS Mercury, any of several ships of the United States Navy
- Mercury (brig), a Russian warship
- Mercury Marine, a manufacturer of marine internal-combustion engines
- Mercury, callsign for Shuttle America, a regional airline in the U.S.
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