The Female Vocalist List , O , 9 vocalists
Name , Country , Type  (Sorry,link pages are in Japanese only)
ODDRUN EIKLI , Norway , Contemporary
OLGA MITROSHINA , France , Contemporary,Vo&P
OLIVIA FOSCHI , USA , Standards
OLIVIA MAISEL ,
France , Standards
OLIVIA TRUMMER , Germany , Contemporary,Vo&P
ONDINE DARCYL ,
USA , Bossa~Latin
OPIE BELLAS USA , Standards~Popular
ORLA MURPHY , UK , Standards
ORNA USA