MS may refer to: Ms., an honorific title for women Ms. (magazine), an American feminist magazine .ms, the Internet country code top-level domain for Montserrat Manuscript, a hand-written document Mississippi, a state in the United States of America Multiple sclerosis, a chronic, inflammatory, demyelinating disease In science and technology: Mass spectrometry, a method of determining the chemical composition or exact mass of molecules Master of Science, a postgraduate university Master's… (More on Ms)