S44 may refer to:
- S44 (New York City bus) serving Staten Island
- S44 (St. Gallen S-Bahn), a railway service in Switzerland
- GER Class S44, a British steam locomotive
- INS Shishumar (S44), a submarine of the Indian Navy
- New Jersey Route 324, designated Route S44 until 1953
- Sulfur-44, an isotope of sulfur
- USS S-44 (SS-155), a submarine of the United States Navy
- S44, a postcode district in Chesterfield, England
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