S43 may refer to:
Submarines
* , of the Royal Navy
* , of the Indian Navy
* , of the United States Navy
Other uses
*
County Route 563 (New Jersey)
County Route 563 (CR 563) is a county highway in the U.S. state of New Jersey. The highway extends from CR 629 (Ventnor Avenue) in Margate City, Atlantic County north to Route 72 in Woodland Township, Burlington County. In Atlantic Count ...
, designated New Jersey Route S43 until 1953
*
County Route S43 (Bergen County, New Jersey)
The following is a list of County routes in New Jersey, county routes in Bergen County, New Jersey, Bergen County in the U.S. state of New Jersey. For more information on the county route system in New Jersey as a whole, including its history, ...
*
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
{{Letter-NumberCombDisambig