S55 may refer to:
Aircraft
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Savoia-Marchetti S.55, an Italian flying boat
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Sikorsky S-55, an American helicopter
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Sukhoi S-55
The Sukhoi S-54 was a series of three closely related aircraft proposals; the S-54 trainer aircraft, S-55 light fighter designed for export, and the S-56 carrier-capable light fighter. All members of the family resemble the Sukhoi Su-27 in gen ...
, a proposed Russian fighter aircraft
Automobiles
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BMW S55, an automobile engine
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Mercedes-Benz S 55 AMG
The Mercedes-Benz W220 was a range of flagship sedans which, as the fourth generation Mercedes-Benz S-Class, replaced the W140 S-Class after model year 1998 — with long and short wheelbase versions, performance and luxury options; available ...
, a luxury car
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Mercury S-55, an American full-size car
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Shorland S55
The Shorland is an armoured patrol car that was designed specifically for the Royal Ulster Constabulary by Frederick Butler. The first design meeting took place in November 1961. The third and final prototype was completed in 1964 and the fir ...
, a British armoured personnel carrier
Rail and transit
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S55 (New York City bus) serving Staten Island
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S55 (St. Gallen S-Bahn), a former S-Bahn line in Thurgau, Switzerland
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S55 (ZVV), a former line of the Zürich S-Bahn
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FGC line S55, a suburban train line in Catalonia, Spain
Other uses
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S55 (star) in the constellation Sagittarius
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Ariel 1, a British satellite
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County Route S55 (Bergen County, New Jersey)
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Explorer S-55 (satellite)
Explorer S-55 was an American satellite launched by NASA on 30 June 1961, as part of the Explorer program. Explorer S-55, was launched using a Scout X-1 launch vehicle from the Wallops Flight Facility (WFF). Its mission was to evaluate the ...
, a failed American spacecraft
* , a submarine of the Indian Navy
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Siemens S55, a mobile phone
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Wandandian language
{{Letter-Number Combination Disambiguation