MSS

MSS may mean:

Management Support System, a technology designed to assist managerial decision making
Manuscripts
Market Segment Share or Market Segment Size
Marymount Secondary School, a girls' secondary school in Hong Kong.
Mass Storage System, a technology employed by the IBM 3850
Maximum segment size, the largest amount of data that a computer or communications device can accommodate in a single, unfragmented segment
Miles Sound System, a win32 library used by Winamp
Military Sensing Symposia, an annual series of mostly-classified conferences
Ministry of State Security, the intelligence service of the People's Republic of China
Multi-Spectral Scanner, a remote sensing instrument on early Landsat satellites