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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|Holden, Dr. Edward S.||USA||1891||1914|
|Hubble, Dr. Edwin Powell||USA||1951||1953|
|Huggins, Dr. Sir William||United Kingdom||1891||1910|
|Hunter, Mr. Andrew F.||Canada||1890||1891|
|Iwanowska, Dr. Wilhelmina||Poland||1973||1999|
|Joy, Dr. Alfred H.||USA||1961||1973|
|Kedzie, Mr. John Hume||USA||1890||1903|
|Keeler, Dr. James Edward||USA||1895||1900|
|King, Dr. William Frederick||Canada||1892||1916|
|Kirkwood, Dr. Daniel||USA||1890||1895|