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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|Bok, Dr. Bart J.||Australia||1961||1982|
|Bateson, Dr. Frank M.||New Zealand||1984||2006|
|Barnard, Dr. Edward Emerson||USA||1901||1923|
|Ball, Dr. Sir Robert Stawell||United Kingdom||1894||1913|
|Baldwin, Dr. Ralph Belknap||USA||1980||2011|
|Baillaud, Dr. Édouard Benjamin||France||1916||1934|
|Backlund, Dr. Oskar||Sweden/Russia||1916||1916|
|Baade, Dr. Wilhelm Heinrich Walter||Germany||1954||1960|
|Ambartsumian, Dr. Viktor Amazaspovitch||USSR/Armenia||1959||1996|
|Adams, Dr. Walter Sydney||USA||1945||1956|