S43

S43 may refer to:

Submarines

• , of the Royal Navy
• Template:INS, of the Indian Navy
• , of the United States Navy

Other uses

• County Route 563 (New Jersey), designated New Jersey Route S43 until 1953
• County Route S43 (Bergen County, New Jersey)
• Harvey Airfield, in Snohomish, Washington, United States
• Sikorsky S-43, an American flying boat
• Sulfur-43, an isotope of sulfur
• S43, a postcode district in Chesterfield, England