The Astronomical Society of the Pacific (ASP) is an American scientific and educational organization, founded in San Francisco on February 7, 1889, immediately following the solar eclipse of January 1, 1889.

Mercury, the ASP's quarterly on-line membership magazine, covers a wide range of astronomy topics, from history and archaeoastronomy to cutting-edge developments.

Volumes are sold to the attendees of the conferences of which the proceedings are published, as well as being offered through the Astronomical Society of the Pacific's AstroShop, and can be found in the libraries of major universities and research institutions worldwide.

Authors have included: The ASP makes several different awards annually: The Astronomical Society of the Pacific is an affiliate of the American Association for the Advancement of Science.

Presidents of the ASP have included such notable astronomers as Edwin Hubble, George O. Abell, and Frank Drake.