S21 or S-21 may refer to:
Automobiles
*
Chery S21, a city car
*
Sisu S-21
Sisu S-21 is a lorry first produced by the Finnish heavy vehicle producer Suomen Autoteollisuus (SAT), then under names Sisu S-22 and S-22K by Yhteissisu, which, after changing its name Vanajan Autotehdas (VAT), produced it with name Vanaja V-48 ...
, a Finnish lorry
Aviation
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De Schelde S.21, a proposed Dutch fighter
*
Rans S-21 Outbound
The Rans S-21 Outbound is an American STOL homebuilt aircraft that was designed by Randy Schlitter and is produced by Rans Designs of Hays, Kansas. It was introduced at AirVenture in 2016. The aircraft is supplied as a quick-build kit for amat ...
, an American homebuilt aircraft
*
SIAI S.21, an Italian racing flying boat
*
Sikorsky S-21, the first four-engine aircraft in the world
*
Short S.21 Maia, a British flying boat mother ship
*
Spalinger S.21, a Swiss training glider
*
Sukhoi-Gulfstream S-21
Sukhoi-Gulfstream S-21 was a projected Russian-American supersonic business jet.
In the early 1990s, Gulfstream Aerospace and the Sukhoi Design Bureau
The JSC Sukhoi Company (russian: ПАО «Компания „Сухой“», ) is a Russ ...
, a proposed American business jet
*
Sunriver Airport in Sunriver, Oregon
Rail and transit
Lines
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S21 (Berlin)
S21 is a planned second north-south route for the Berlin S-Bahn, which will connect Berlin Hauptbahnhof to the Berlin Ringbahn to both north and south. The first section is under construction and is expected to go into operation in December 2022. ...
, a planned S-Bahn line in Berlin, Germany
*
S21 (RER Fribourg)
The S21 is a railway service of RER Fribourg that provides hourly service between and , in the Swiss cantons of Vaud and Freiburg, respectively. Transports publics Fribourgeois
The Transports Publics Fribourgeois (TPF) is a renaming of the fo ...
, an S-Bahn line in the canton of Freibourg, Switzerland
*
S21 (ZVV)
The S21 is a regional railway service of the Zürich S-Bahn of the Zürcher Verkehrsverbund (ZVV). The service operates at peak hour
A rush hour (American English, British English) or peak hour (Australian English) is a part of the day du ...
, an S-Bahn line in the cantons of Zürich and Zug in Switzerland
*
Stuttgart 21, a transportation and urban project in Stuttgart, Germany
* S21, a line of the
Hamburg S-Bahn
Stations
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Ginzan Station
is a railway station in Niki, Hokkaidō, Hokkaidō, Japan. It is operated by JR Hokkaido and has the station number "S21".
Lines
Ginzan Station is served by the Hakodate Main Line and is 213.4 km from the start of the line at .
Station ...
, in Niki, Hokkaidō, Hokkaidō, Japan
*
Moto-Yawata Station
is a junction passenger railway station in the city of Ichikawa, Chiba, Japan, operated by East Japan Railway Company (JR East) and Tokyo Metropolitan Bureau of Transportation (Toei Subway). It is the only station on the Toei Subway that is locat ...
, in Ichikawa, Chiba, Japan
*
Shin-Fukae Station, in Osaka, Japan
*
Tokushige Station, in Midori-ku, Nagoya, Aichi, Japan
Roads
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S21 Guangzhou–Huidong Expressway, China
*
County Route S21 (California)
There are 34 routes assigned to the "S" zone of the California Route Marker Program, which designates county routes in California. The "S" zone includes county highways in Imperial, Orange, Riverside, San Diego, and Santa Barbara counties.
...
, United States
Submarines
* , of the Argentine Navy
*
* , of the Royal Navy
* , of the Indian Navy
* , of the Indian Navy
* , of the United States Navy
Other uses
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40S ribosomal protein S21
*
British NVC community S21, a
swamps and tall-herb fens community in the British National Vegetation Classification system
* ''
S-21: The Khmer Rouge Killing Machine'', a 2003 documentary film
*
S21: When using do not smoke, a safety phrase
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Samsung Galaxy S21
The Samsung Galaxy S21 is a series of Android-based smartphones designed, developed, marketed, and manufactured by Samsung Electronics as part of its Galaxy S series. They collectively serve as the successor to the Samsung Galaxy S20 series. Th ...
, a series of smartphones
*
Security Prison 21
The Tuol Sleng Genocide Museum ( km, សារមន្ទីរឧក្រិដ្ឋកម្មប្រល័យពូជសាសន៍ទួលស្លែង) or simply Tuol Sleng ( km, ទួលស្លែង, link=no, ; lit. "Hill of ...
, now the Tuol Sleng Genocide Museum in Cambodia
*
Serbia 21, a political organization in Serbia
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