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.
| Nation(s) | Start |
End |
|
|---|---|---|---|
| von Struvé, Dr. Otto Wilhelm | Russia | 1894 | 1899 |
| Keeler, Dr. James Edward | USA | 1895 | 1900 |
| Shearmen, Mr. T.S.H. | Canada | 1890 | 1900 |
| Russell, Rev. Norman H. | Canada/India | 1898 | 1902 |
| Kedzie, Mr. John Hume | USA | 1890 | 1903 |
| Henry, M. Paul | France | 1894 | 1905 |
| Newnham, Right Rev. Jervois Arthur | United Kingdom/Canada | 1895 | 1905 |
| Greenwood, Cpt. W. Nelson | United Kingdom | 1898 | 1906 |
| Langley, Dr. Samuel Pierpont | USA | 1894 | 1906 |
| Loewy, M. Maurice | France | 1901 | 1907 |