SSW may refer to:
- South-SouthWest compass direction, see: Boxing the compass
- SSW, the callsign of a TV station in the South West and Great Southern regions of Western Australia
- Seminary of the Southwest, an Episcopal seminary in Austin, Texas, USA
- St. Louis Southwestern Railway, reporting mark SSW
- South Schleswig Voter Federation, German: Südschleswigscher Wählerverband
- Schichau Seebeckwerft, a German shipbuilding corporation
- Siemens-Schuckertwerke, a German electrical engineering company
- Special Service Wing, an independent commando division of the Pakistan Air Force
- Sudden stratospheric warming, a meteorological phenomenon in the upper troposphere
- Southern States Wrestling, a professional wrestling promotion
- Swati language ISO 639 code