Oakton John Leslie
Oberjohn William Joseph
Oh Kwang Heon
Oh Se-Yoon
Ohgushi Shin
Ohkubo Yoshitoyo
Ohkura Ryoichi
Ohshima Mituzi
Ohta Hiromoto
Okamoto Shigemi
Onishi Toshiya
Oplatka Georg
Organisation Europeenne de Recherches Spatiales
Oshima Susumu
Oshima Yoshikuni
Ozaki Eiichi