Advertisements / O
- O.A. Jenkins & Co. (hat & furs/Boston): The Middleman/ Boston / April 25, 1892
- Oak Grove (dairy/Boston): The Middleman/ Boston / April 25, 1892
- Ober's (restaurant/Boston): The Middleman/ Boston / April 25, 1892
- O'Brien Girl (the) (play; NYC): The Merry Widow / Oct. 17, 1921
- Odo-Ro-No (deodorant): Turn to the Right / June 1917
- Oglivia Sisters (hair specialists/NYC): Dance Magazine / March 1931 (p54)
- Oklahoma! (musical/NYC): Up In Central Park / Broadway Theatre / Jan. 21, 1946; Show Boat / June 1946
- Old Angus (Scotch whiskey): See My Lawyer / Nov. 27, 1939; Ballet Theatre / Jan. 19, 1940 (First Season)
- Old Colonial Brand (whiskey): The Middleman/ Boston / April 25, 1892
- Old Colony Trust Company (Boston): Disraeli / Boston / Jan. 6, 1913
- Old Crow (bourbon): Kiss Me, Kate / May 23, 1949; Ballet Theatre / Oct. 29, 1942
- Old English Curve Cut Tobacco: Lord and Lady Algy / Boston / Nov. 13, 1899
- Old Gold (cigarettes): Mr. Moneypenny / Nov. 5, 1928; Up In Central Park / Broadway Theatre / Jan. 21, 1946; Show Boat / June 1946; Kiss Me, Kate / May 23, 1949; Ballet Theatre / Oct. 29, 1942
- Old Grand-Dad (whiskey): Ballet Theatre / October 29, 1942; The Me Nobody Knows / Helen Hayes Theatre / Dec. 1970
- Old Homestead, the (play/Boston): Boston / The Other Girl / Oct. 10, 1904
- Oldsmobile (automobile): Kiss Me, Kate / May 23, 1949, Ballet Theatre / Oct. 29, 1942; New York City Ballet / March 1955; Dark is Light Enough (the) / April 18, 1955; Tenderloin / 1960
- Old Overholt Whiskey: Hamlet / Nov. 21, 1938; Henry IV - Part I / Jan. 30, 1939; No Time For Comedy / April 24, 1939; See My Lawyer / Nov. 27, 1939; Ballet Theatre / Jan. 19, 1940 (First Season)
- Old San Juan (NYC/restaurant): The Jello Is Always Red / 1998
- Old Schenley (rye, bourbon): Pal Joey (w/ticket stubs) / April 28, 1952
- Old Shay DeLuxe Beer: His and Hers / Pittsburgh, PA / Dec/ 11, 1953
- Old Smuggler Brand Scotch: Pal Joey (w/ticket stubs) / April 28, 1952
- Olenik Records: Hit Parader / March 1965
- O'Lunney's Times Square Pub (NYC): The Jello Is Always Red / 1998
- Olypic Limousine, Inc. (NYC): Merrily We Roll Along (1994)
- Omega Oil: Show Girl / June 9, 1902
- Ondine (perfume): The Me Nobody Knows / Helen Hayes Theatre / Dec. 1970
- One-hundred (100) Dolls: Hit Parader / March 1965
- One of the Family (play): Young Blood / Jan. 11, 1926
- One Shubert Alley (NYC/gift shop): Merrily We Roll Along (1994)
- Only 38 (play/NYC): The Merry Widow / Oct. 17, 1921
- On Slender Accident (NYC): Cages / 1963
- Onyx Hosiery: The Merry Widow / Oct. 17, 1921; Criss Cross / Jan. 17, 1927
- Onyx Pointex (silk stockings): Young Blood / Jan. 11, 1926; Honeymoon Lane / Feb. 28, 1927; Follow Thru / May 27, 1929
- Oppenheim, Collins & Co.(furs/NYC): Leah Kleschna / Feb. 13, 1905; The Merry Widow / Oct. 17, 1921; Criss Cross / Jan. 17, 1927; Honeymoon Lane / Feb. 28, 1927; Follow Thru / May 27, 1929
- Orangine (medicine): Show Girl / June 9, 1902; Leah Kleschna / Feb. 13, 1905
- Orlando Tompkins: Fowl Play / Boston / Sept. 1868
- O.S. Currier's (ladieswear/Boston): Fowl Play / Boston / Sept. 1868
- Osgood's (furniture): Love On Crutches / Boston / Oct. 1, 1894
- O'Shea's Department Store (Laconia, NH): John Loves Mary / Lakes Regions Playhouse, NH / July 30, 1962
- Ostendorf's Cafe: Merry Widow / Jan. 25, 1909
- Osteria AlDoge (NYC/restaurants): The Jello Is Always Red / 1998
- Oval Room (cocktails/Boston): Yes M'Lord / Boston / Feb. 6, 1950
- Ovington's (gift shop): The Merry Widow / Oct. 17, 1921; Madame Pompadour / Nov. 17, 1924; Young Blood / Jan. 11, 1926
- Owen P. McDonald, Florist (NYC): Evangeline / Oct. 10, 1885