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