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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|Greenwood, Cpt. W. Nelson||United Kingdom||1898||1906|
|Wolfer, Prof. Alfred||Switzerland||1904||1931|
|Backlund, Dr. Oskar||Sweden/Russia||1916||1916|
|Lindblad, Dr. Bertil||Sweden||1956||1965|
|von Struvé, Dr. Otto Wilhelm||Russia||1894||1899|
|Iwanowska, Dr. Wilhelmina||Poland||1973||1999|
|Bateson, Dr. Frank M.||New Zealand||1984||2006|
|Oort, Dr. Jan Hendrik||Netherlands||1954||1992|
|van de Hulst, Prof. Hendrik||Netherlands||1968||2000|
|Gonzalez de León, Sr. Luis||Mexico||1903||1914|