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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|Reber, Mr. Grote||USA/Australia||1988||2002|
|Robinson, Mr. Leif J.||USA||2000||2011|
|Rogers, Prof. William A.||USA||1894||1898|
|Russell, Prof. Henry Norris||USA||1946||1957|
|Russell, Rev. Norman H.||Canada/India||1898||1902|
|Ryle, Sir Martin||United Kingdom||1973||1983|
|Sandage, Dr. Allan R.||USA||1975||2010|
|Schlesinger, Dr. Frank||USA||1916||1943|
|Schwarzschild, Dr. Martin||USA||1963||1999|
|Shapley, Dr. Harlow||USA||1947||1972|