S11

S11 may refer to:

Aircraft

• Fokker S-11, a trainer aircraft
• Rans S-11 Pursuit, an American light aircraft
• SABCA S.11, a Belgian prototype airliner
• Sikorsky S-11, a Russian reconnaissance aircraft
• SPAD S.XI, a French reconnaissance biplane

Rail and transit

Lines

• S11 (Rhine-Ruhr S-Bahn), Germany
• S11 (ZVV), Zürich, Switzerland
• Line S11 (Milan suburban railway service), Italy
• S11, of the Hamburg S-Bahn, Germany
• S11, of the Karlsruhe Stadtbahn, Germany

Locomotives

• ALCO S-11, a diesel-electric switcher
• LSWR S11 class, a steam locomotive
• Sri Lanka Railways S11, a diesel multiple unit

Stations

• Kitanada Station, in Ōzu, Ehime Prefecture, Japan
• Morishita Station (Tokyo), in Kōtō, Tokyo, Japan
• Myōhōji Station (Hyōgo), in Suma-ku, Kobe, Hyōgo Prefecture, Japan
• Sakurayama Station, in Mizuho-ku, Nagoya, Aichi Prefecture, Japan
• Wutthakat BTS station, in Bangkok, Thailand
• Zenibako Station, in Otaru, Hokkaido, Japan

Roads

• S11 highway (Georgia)
• Expressway S11 (Poland)
• County Route S11 (California), United States

Submarines

• Brazilian submarine Rio Grande do Sul (S11) (Balao class), in service 1963–1972
• Brazilian submarine Rio Grande do Sul (S11) (Tench class), in service 1972–1978
• HMS Orpheus (S11), of the Royal Navy
• USS S-11 (SS-116), of the United States Navy

Other uses

• S11 (classification), a disability swimming classification
• S11 (protest), at the meeting of the World Economic Forum in Melbourne, Australia on September 11, 2000
• 40S ribosomal protein S11
• British NVC community S11, see swamps and tall-herb fens in the British National Vegetation Classification system
• Nissan Silvia (S11), a sports car
• Project S-11, a video game
• September 11 attacks
• S11, a postcode district in Sheffield, England
• S-11, a creature in the Sharktopus film
• Voltage reflection coefficient $S_{11}$ of a two-port network