MS1 may refer to:
- FMA Ae. M.S.1, an air ambulance version of the 1932 Argentine FMA AeC.2 utility aircraft
 - MS1, the first device in tandem mass spectrometry
 
MS-1 may refer to:
- Mercury-Scout 1, a 1961 satellite
 - Mississippi's 1st congressional district
 - Mississippi Highway 1
 - Roland MS-1 Digital Sampler
 - T-18 tank
 - A type of Trams of Putilov plant
 - MegaSquirt 'n Spark-Extra (MS1/Extra), a type of MegaSquirt electronic fuel injection controller
 - MS-1 (wrestler), Mexican professional wrestler
 - Metres per second, the SI unit of velocity, written as ms−1
 - A first year medical student
 - MS-1 (spaceplane), a proposed US Spaceplane
 
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