O'brien Brian A.
O'brien Gene E.
O'brien Harold A. (jr.)
O'brien N. Robert
O'callaghan John
O'connell Gary
O'grady Austin
O'hara Patricia Ann
O'kane P. T.
O'kane P. Terry
O'kane Patrick T.
O'malley Glen Peter
O'neil Gregory Robert
O'neill Charles E.
O'neill Charles Edward
O'neill Gary A.
Oak Eugene (a/k/a Yoon Tae-Auck)
Oberlin Agnes
Occtech Engineering Pty Ltd.
Ocean Mining Associates (a Partnership)