MTSS may refer to:
Organisations Ministerio de Trabajo y Seguridad Social, the Uruguayan ministry of labour and social security Ministry of Labour, Solidarity and Social Security (Ministério do Trabalho, Solidariedade e Segurança Social) Military Training and Survival School, of the Irish Air Corps Stock symbol of MTS (network provider) at the Moscow Exchange
Other uses Medial tibial stress syndrome, known also as tibial periostitis or shin splints, a common injury affecting athletes Menstrual toxic shock syndrome (mTSS), a rare complication of tampon use Manuscript tracking systems (MTSs); See iThenticate Multiteam system (MTSs)
See also MTSS1 (Metastasis suppressor protein 1), a protein MTS (disambiguation)