Honorary Membership was limited to 10 from 1890-1900, and to 15 from 1901 onwards. Corresponding Membership was a lesser class of Honoris causa membership in the early years. A few honorary members, such as Barnard, were first made corresponding members for a short time before being recommissioned as honorary members.
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|Hubble, Dr. Edwin Powell||USA||1951||1953|
|Barnard, Dr. Edward Emerson||USA||1901||1923|
|Brashear, Dr. John A.||USA||1901||1920|
|Hale, Dr. George Ellery||USA||1900||1938|
|Holden, Dr. Edward S.||USA||1891||1914|
|Keeler, Dr. James Edward||USA||1895||1900|
|Kirkwood, Dr. Daniel||USA||1890||1895|
|Langley, Dr. Samuel Pierpont||USA||1894||1906|
|Newcomb, Rear Admiral Dr. Simon||USA||1891||1909|
|Pickering, Dr. Edward Charles, OPM||USA||1894||1919|