The American Meteorological Society (AMS) is a scientific and professional organization in the United States promoting and disseminating information about the atmospheric, oceanic, and hydrologic sciences. Its mission is to advance the atmospheric and related sciences, technologies, specifications, applications and services for the benefit of society.

Founded on December 29, 1919, by Charles F. Brooks, at a meeting of the American Association for the Advancement of Science in St. Louis, and incorporated on January 21, 1920, the American Meteorological Society has a membership of more than 13,000 weather, water, and climate scientists, professionals, researchers, educators, students, and enthusiasts.

AMS publishes 12 atmospheric and related oceanic and hydrologic journals (in print and online), sponsors as many as twelve conferences annually, and administers professional certification programs and awards. The AMS Policy and Education programs promote scientific knowledge and work to increase public understanding of science. There is also a network of 94 local and student AMS chapters.

AMS headquarters is located at 45 Beacon Street adjacent to the Boston Common in Boston, Massachusetts. The headquarters building was designed by Charles Bulfinch as the third Harrison Gray Otis House in 1806 and was purchased and renovated by AMS in 1958, with staff moving into the building in 1960. In 2012, AMS purchased the building next door at 44 Beacon Street, also designed by Bulfinch. AMS also maintains an office in Washington, D.C., at 1200 New York Avenue NW inside the AAAS headquarters.

The American Meteorological Society is not to be confused with the American Meteor Society, a group of volunteers who observe and track meteors and fireballs.

AMS maintains five professional certification programs. The Certified Broadcast Meteorologist (CBM) program sets a professional standard in broadcast meteorology. The Certified Consulting Meteorologist (CCM) program establishes high standards of technical competence, character, and experience for consultants who provide advice in meteorology to the public. The Certified Digital Meteorologist Program (CDM) program sets standards for meteorologists who meet criteria for effective communication in all forms of digital media. The AMS Seal of Approval was launched in 1957 to recognize on-air meteorologists for their sound delivery of weather information to the general public. Many seal holders are still active, though the original Seal was succeeded by the CBM. Those looking for an expert can consult the listings of all AMS Certified individuals. A recent addition is the Certified AMS Teacher (CAT), a graduate-level certificate for K-12 teachers.

AMS recognizes excellent work with over 30 different awards ranging from outstanding research contributions in specific fields to awards for excellence in teaching or broadcasting, outstanding books, exceptional service in forecasting, and more, including its highest honor: the Carl-Gustaf Rossby Medal.

AMS also awards more than $100,000 annually in undergraduate and graduate level scholarships and fellowships.