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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|Ambartsumian, Dr. Viktor Amazaspovitch||USSR/Armenia||1959||1996|
|Shklovsky, Dr. Iosif S.||USSR||1966||1984|
|Proctor, Mrs. Richard A.||USA/Ireland||1891||1896|
|Winder, Mr. Daniel K.||USA/Canada||1890||1891|
|Reber, Mr. Grote||USA/Australia||1988||2002|
|Baldwin, Dr. Ralph Belknap||USA||1980||2011|
|Robinson, Mr. Leif J.||USA||2000||2011|
|Sandage, Dr. Allan R.||USA||1975||2010|
|Bowen, Dr. Ira S.||USA||1956||1973|
|Clemence, Dr. Gerald M.||USA||1964||1974|