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 |
| O'Brian, Thomas R. | United States | United States |
| O'Brien, Paul Thomas | United Kingdom | United Kingdom |
| O'Brien, Tim | United Kingdom | United Kingdom |
| O'Byrne, John W. | Australia | Australia |
| O'Connell, Robert F. | United States | United States |
| O'Connell, Robert West | United States | United States |
| O'Connor, Seamus L. | Ireland | Ireland |
| O'Dea, Christopher P. | United States | United States |
| O'Dell, Charles R. | United States | United States |
| O'Dell, Stephen L. | United States | United States |
| O'Donoghue, Darragh | South Africa | South Africa |
| O'Handley, Douglas A. | United States | United States |
| O'Mongain, Eon | Ireland | Ireland |
| O'Neal, Douglas B. | United States | United States |
| O'Neil, Karen L. | United States | United States |
| O'Sullivan, Créidhe | Ireland | Ireland |
| O'Sullivan, Denis F. | Ireland | Ireland |
| O'Sullivan, John David | Australia | Australia |
| O'Toole, Simon J. | Australia | Australia |
| Oberst, Thomas E | United States | United States |
| OBI, Shinya | Japan | Japan |
| Oblak, Edouard | France | France |
| Obregón Díaz, Octavio José | Mexico | Mexico |
| Obridko, Vladimir N. | Russian Federation | Russian Federation |
| Ochsenbein, François | France | France |
| Ocvirk, Pierre | France | France |
| Odell, Andrew P. | United States | United States |
| Odenwald, Sten F. | United States | United States |
| Ödman, Carolina Johanna | South Africa | South Africa |
| O'Donoghue, Aileen A | United States | United States |
| Dušan Odstrcil, Dusan | Czech Republic | Czech Republic |
| Oegerle, William R. | United States | United States |
| Oemler Jr, Augustus | United States | United States |
| Oestreicher, Roland | Germany | Germany |
| Oetken, L. | Germany | Germany |
| Oey, Sally | United States | United States |
| Ofek, Eran Oded | Israel | Israel |
| Ofir, Aviv | Germany | Germany |
| Ofman, Leon | United States | United States |
| Ogando, Ricardo Lourenço Correia | Brazil | Brazil |
| OGAWA , Hideo | Japan | Japan |
| OGAWARA , Yoshiaki | Japan | Japan |
| Ogelman, Hakki B. | United States | United States |
| Ogl'oza, Waldemar | Poland | Poland |
| OGURA , Katsuo | Japan | Japan |
| OH, Kap Soo | Korea, Rep of | Korea, Rep of |
| OH, Kyu Dong | Korea, Rep of | Korea, Rep of |
| OH, Suyeon Yelena | Korea, Rep of | Korea, Rep of |
| Ohashi, Nagayoshi | United States | United States |
| OHASHI , Takaya | Japan | Japan |
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