AMSS may stand for: Metropolitan Area of San Salvador (Área Metropolitana de San Salvador) Amarchand & Mangaldas & Suresh A Shroff & Co, an Indian law firm Amplitude modulation signalling system, a digital system for adding information to AM broadcast signals Ainsworth's Maternal Sensitivity Scale, a measure of maternal sensitivity Aeronautical mobile-satellite service Auto-Moto Association of Serbia, an FIA member organisation