O'Brian, Patrick
O'Brien, Robert C.
Obrutschew, Wladimir Afanasjewitsch
O'Connell, James Francis
O'Dell, Scott
Oehlenschläger, Adam Gottlieb
Oertel, Philipp Friedrich Wilhelm
Offenbach, Jacques
Okuda, Kikumaru
Oldtenbach, Alfred
Olsen, Lars-Henrik
Orelli, Friedrich
Orlev, Uri
Orlowski, Jerzy-Henryk
Orr, Wendy Ann
Ort, Mik
Oser, Erich
Oswald, Heinrich
Ottmann, Victor
Otto, Friedrich
Oven, Ingo von