American Philosophical Society

American Philosophical Society Hall
U.S. National Register of Historic Places
U.S. National Historic Landmark
Philosophical Hall, the headquarters of the American Philosophical Society in Philadelphia
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Location	104 S. Fifth St., Philadelphia, Pennsylvania, U.S.
Coordinates	39°56′55″N 75°8′58″W / 39.94861°N 75.14944°W / 39.94861; -75.14944
Built	1787
Architect	Samuel Vaughan
Architectural style	Georgian
Website	amphilsoc.org
NRHP reference No.	66000675[1]
Significant dates
Added to NRHP	January 12, 1965
Designated NHL	January 12, 1965

The American Philosophical Society (APS) is an American scholarly organization and learned society founded in 1743 in Philadelphia that promotes knowledge in the humanities and natural sciences through research, professional meetings, publications, library resources, and community outreach. It was founded by the polymath Benjamin Franklin and is considered the first learned society founded in what became the United States.

Philosophical Hall, the society's headquarters and a museum, is located just east of Independence Hall in Independence National Historical Park. In 1965, in recognition of the building's history, it was designated a National Historic Landmark.

The society has about 1,000 elected members. As of April 2020, 5,710 members had been inducted since its creation. Through research grants, published journals, the American Philosophical Society Museum, an extensive library, and regular meetings, the society supports a variety of disciplines in the humanities and the sciences.