Oakes, Betty - Sarah Brown in Guys and Dolls (1955);

Oakes, Gary - Freddy in My Fair Lady (1968); Jim Morgan in Superman (1967);

O'Bannon, H.W. - Mngr. For Fisk University Male Octette in Show Boat (1930);

O'Brien, Louise - Laurey in Oklahoma! (1962);

O'Brien, Mortimer - Balalaika (1943);

O'Brien, Raymond - Bellrose in Cyrano de Bergerac (1934); Interpretor to King of Cambodia in East Wind (1934); Last Waltz (1934); Madmoiselle Modiste (1934); Henrich in Music in the Air (1934); Knife Thrower in Rose of Algeria (1934); Lt. Harvey in Sweet Adeline (1934); Ambassador to Zilania in Sweethearts (1934); Von Hoffenstein in Three Little Girls (1931);

O'Brien, Thomas - Robert Livingston in 1776 (1999); Charlie Dalrymple in Brigadoon (1990);

O'Brien, Thomas E. - Priest in Jesus Christ Superstar (2005);

O'Brien, Tom - Bishop of Digne/Loud Hailer in Les Miserables (2007); Cecco in Peter Pan (2007);

O'Bryan, Shannon - Sandy Dumbrowski in Grease (2007); Tiger Lily in Peter Pan (2007); June in Gypsy (2006); Judy Haynes in White Christmas (2006); Clarice in West Side Story (2005);

O'Connell, Patricia - Sue Smith in No, No, Nanette (1928); Charlotte in Princess Flavia (1928); Olga in The Merry Widow (1928); Jehanneton in Vagabond King (1928);

O'Connor, Carroll - The Carroll O'Connor Show (1973);

O'Connor, Donald - Noble Eggelston in Little Me (1980); Osgood Fielding in Sugar (1979); Noble Eggelston in Little Me (1965);

O'Dare, Eileen - Charlotte Payne in Hit The Deck (1948);

O'Dea, June - Polly in Kid Boots (1936); Nanette in No, No, Nanette (1936); Lou Ellen in Oh Boy (1936);

Odell, Maude - Lizzie in Maytime (1930); Landlady in Show Boat (1930); Grand Dutchess Anastasia in The Student Prince (1930);

Odlin, Richard - James O'Neill Whistler in Knights of Song (1938);

O'Gorman, Michael - Harry Beaton in Brigadoon (1979);

O'Grady, Mike - Yussef Youssevitch in Of Thee I Sing (1950);

O'Hara, Jenny - Katie in Meet Me In St. Louis (1994);

O'Hara, Jill - Two Gentlemen of Verona (1973); Promises, Promises (1970);

Ojeda, Perry - Don Fernando in A Chorus Line (1997); Ambrose Kemper in Hello, Dolly! (1997);

Olaf, Pierre - Passepartout in Around the World in 80 Days (1962);

Oldroyd, Marjery - Stock in Muny Season (1949);

Olfson, Ken - Frump in How To Succeed In Business… (1981);

Oliver, Clifton - Judas / John the Baptist in Godspell (2003);

Oliver, Raymond - Philippe in New Moon (1954); Capt. Doris Van Damm in Red Mill (1954);

Oliver, Thelma - Nellie Bly in I Dream of Jeanie (1963);

Oliveri, Nicholas - Young Cosmo in Singin' In The Rain (2005);

Oliveri, Nick - Newsboy in Gypsy (2006);

Olivette, Nina - Ellie in Show Boat (1947); Pauline in No, No, Nanette (1936);

Olivetti, Eva - Ingenue in Muny Season (1920);

Olsen, Olive - Gabriella in Louie the 14th (1937); Bessie Fain in Salute to Spring (1937); Sidonie in The Prince of Pilsen (1937);

Olvis, William - Caliph in Kismet (1956); Capt. Doris Van Damm in Red Mill (1954); Season - stock in Muny Season (1952);

O'Malley, Muriel - Aurelia in Chocolate Soldier (1956); Greta in Great Waltz (1956); Aunt Minnie in Roberta (1954); Mother Grieg in Song of Norway (1954); Frau Lilli Kirschner in Music in the Air (1951); Greta in The Great Waltz (1951); Aunt Em/1st Witch in The Wizard of Oz (1951); Greta in Great Waltz (1946); Aunt Em/1st Witch in The Wizard of Oz (1946);

O'Neal, William - Season - stock in Muny Season (1943); Col. Balakirev in Balalaika (1941); Capt. August Lutte in Bitter Sweet (1941); John Thurston in Firefly (1941); J.P. Bowden in Irene (1941); Achille Caresse in New Orleans (1941); Pablo in Nina Rosa (1941); Lt. Karl in Sweethearts (1941); Athos in Three Musketeers (1941);

O'Neil, Betty - Dorothy in Gentlemen Prefer Blondes (1959); Katie Bean in Rio Rita (1959);

O'Neil, F.J. - Season - stock in Muny Season (1961);

O'Neil, James (Frank) - Bartender/Drunk in Anything Goes (1960); u.s. Benjamin Kidd in Desert Song (1960); G.B. Shaw/Tribune Reporter in Knights of Song (1960); u.s. Rowan & Martin in Red Mill (1960); u.s. George Poppett in Redhead (1960); Hubert in The Student Prince (1960);

O'Neil, Joan - Maggie in A Chorus Line (1989);

O'Neil, Tricia - Guenevere in Camelot (1975);

Operti, LeRoi - Season - stock in Muny Season (1945); Season - stock in Muny Season (1944);

Orbach, Jerry - Chicago (1977); Promises, Promises (1970);

O'Reily, Mary Ann - Sugar in Sugar (1979);

Orest - Alexis in On Your Toes (1939);

Orin, Renee - Essie in Take Me Along (1974);

Orin Davenport & Company - Circus Act in Circus Princess (1931);

Orselli, Raimonda - Liat in South Pacific (1957); Dancer in Carousel (1955); Dancer in Rodgers and Hammerstein Concert (1955); Dancer in The King and I (1955);

Ortega, Rosita - Carmen in Rio Rita (1935); Kitzy in Teresina (1935);

O'Shea, Milo - Doolittle in My Fair Lady (1979);

Ossman, Carol - Mazie Gripps in The Cat and the Fiddle (1952);

Osta, Teresita - Spanish Dancer in Babette (1939);

Ostendorf, John - Von Asterberg in The Student Prince (1972);

Osterwald, Bibi - Lucille in No, No, Nanette (1953);

Ostrin, Art - Evil Eye Fleagle in Li'l Abner (1980);

O'Sullivan, James - Cliff in Cabaret (1971);

O'Sullivan, Kathleen - Madame Olga Novikovich in The Merry Widow (1980);

Oswald, Virginia - Fiona MacLaren in Brigadoon (1955); Natalie in The Merry Widow (1955); Fiona MacLaren in Brigadoon (1950);

Othon, Yvonne - Anita in West Side Story (1963);

Ottley, Rachelle - Cinderella in Cinderella on Ice (1990);

Ousey, Tim - Boy/u.s.Oliver in Oliver! (1970);

Ousley, Robert - Capt. Of Inquisition in Man of LaMancha (1995);

Overshown, Kent - Cockney in My Fair Lady (2008); Major Domo in Les Miserables (2007); 2nd Helper in The Pajama Game (2007);

Owen, Bethany - Alex in Dream Street (1984);

Oxenhandler, Neal - Child in The American Way (1940);

Oxford, Earl - Sidney Smith in On Your Toes (1939); Richard Johns in Queen High (1939); Edward Hawley in Rose Marie (1939);

Oyster, Jim - Phra Alack in The King and I (1989); Franz/u.s.Von Trapp/u.s.Max in The Sound of Music (1977);