AAS

Initialism of Australian Anthropological Society.

Initialism of American Arachnological Society, a society of amateur and professional arachnologists.

Initialism of American Astronautical Society, an independent scientific and technical group in the United States.

Initialism of American Astronomical Society, a United States society of professional astronomers.

Initialism of Australian Academy of Science, an independent, government-endorsed society with the aim of promoting science.

Initialism of All-America Selections, an organization that promotes development of new garden seed varieties.

Initialism of Air Ambulance Service, a UK charity.

Initialism of Assyrian Aid Society.

Initialism of American Anti-Slavery Society.

Initialism of Ansar al-Sunna, or Jamaat Ansar al-Sunna, a militant group operating in Iraq.