S41

S41 may refer to:

Aircraft

• Blériot-SPAD S.41, a French fighter aircraft
• Short S.41, a British biplane floatplane
• Sikorsky S-41, an American flying boat

Rail and transit

• S41 (Berlin), a line of the Berlin S-Bahn
• S41 (Long Island bus)
• S41 (ZVV), a line of the Zürich S-Bahn

Submarines

• ARA Santa Cruz (S-41), of the Argentine Navy
• Brazilian submarine Humaitá (S41)
• HMS Unseen (S41), of the Royal Navy
• INS Vagir (S41), of the Indian Navy
• USS S-41 (SS-146), of the United States Navy

Other uses

• New Jersey Route 73, designated Route S41 until 1953
• S41: In case of fire and/or explosion do not breathe fumes, a safety phrase
• Sulfur-41, an isotope of sulfur
• Xhosa language
• S41, a postcode district in Chesterfield, England