Individual Members
Professional scientists whose research is directly relevant to some branch of astronomy are eligible for election as Individual Members. Individual Members are, normally, admitted by the Executive Committee on the proposal of a National Member.
Total: 10869 Individual Members.
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
| Member | Location | NCA adherence |
| Olowin, Ronald Paul | United States | United States |
| Olsen, Erik H. | Denmark | Denmark |
| Olsen, Hans Jørn Fogh | Denmark | Denmark |
| Olsen, Knut A.G. | United States | United States |
| Olson, Edward C. | United States | United States |
| Olthof, Henk | Netherlands | Netherlands |
| Oluseyi, Hakeem M | United States | United States |
| Omarov, Tuken B. | Kazakhstan | Kazakhstan |
| Omizzolo, Alessandro | Italy | Italy |
| Omnes, Roland | France | France |
| Omont, Alain | France | France |
| OMUKAI, Kazuyuki | Japan | Japan |
| ONAKA , Takashi | Japan | Japan |
| Önel, Hakan | Germany | Germany |
| Onello, Joseph S. | United States | United States |
| ONISHI , Toshikazu | Japan | Japan |
| Onken, Christopher Alan | Australia | Australia |
| Onuora, Lesley Irene | United Kingdom | United Kingdom |
| OOHARA , Ken-ichi | Japan | Japan |
| Oosterloo, Thomas Anne | Netherlands | Netherlands |
| OOWAKI , Naoaki | Japan | Japan |
| Oozeer, Nadeem optional | South Africa | South Africa |
| Opara, Fidelix Ekeoma | Nigeria | Nigeria |
| Opher, Reuven | Brazil | Brazil |
| Opolski, Antoni | Poland | Poland |
| Oprescu, Gabriela | Romania | Romania |
| Oproiu, Tiberiu | Romania | Romania |
| Orchiston, Wayne | Thailand | Thailand |
| Ord, Stephen M. | United States | United States |
| Orellana, Mariana | Argentina | Argentina |
| Orellana, Rosa B. | Argentina | Argentina |
| Orford, Keith J. | United Kingdom | United Kingdom |
| Orienti, Monica | Italy | Italy |
| Origlia, Livia | Italy | Italy |
| Orio, Marina | Italy | Italy |
| Orlandini, Mauro | Italy | Italy |
| Orlando, Salvatore | Italy | Italy |
| Orlin, Hyman | United States | United States |
| Orlov, Victor V. | Russian Federation | Russian Federation |
| Ormes, Jonathan F. | United States | United States |
| Orsatti, Ana María | Argentina | Argentina |
| Ortiz, Jose L. | Spain | Spain |
| Ortiz, Roberto | Brazil | Brazil |
| Ortiz Carbonell, Ada | Norway | Norway |
| Ortiz Gil, Amelia | Spain | Spain |
| Ortolani, Sergio | Italy | Italy |
| Orton, Glenn S. | United States | United States |
| OSAKI, Yoji | Japan | Japan |
| Osborn, Wayne | United States | United States |
| Osborne, John L. | United Kingdom | United Kingdom |
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