S
- Saab AB — Sweden
- SACMA
- Salmson — France
- Schmidding — Germany
- Scott
- Seld
- SEPR
- SERMEL
- Shenyang — China
- Shvetsov — Russia/Soviet Union
- Siddeley-Deasy — UK
- Siemens AG — Germany
- Siemens-Halske — Germany
- Silnik
- Simms
- Skoda Works — Czech Republic
- Skymotors
- SMA Engines
- Smalley
- SME Aircraft Engine
- Smith
- SNECMA — France
- Solar Aircraft Company — US
- Soloviev — Russia/Soviet Union
- Speer
- Sperry
- Star
- Statax
- Straughan
- Studebaker-Waterman
- Studebaker — U.S.
- Sturtevant
- Sunbeam — UK
- Superior
- Svenska Flygmotor — Sweden
- Szekely Aircraft & Engine Co. — U.S.
Read more about this topic: List Of Aircraft Engine Manufacturers