- Oak & Denny SEE: Denny, Al
- Oak Ridge Quartet SEE:
- Oakwood, Bob
- O'Bannon, Charley
- O'Berry, Mike
- O'Connor, Eddie SEE: Edwards, Hank
- O'Connor, Keith SEE: Torkays
- O'Day, Molly SEE:
- Oddballs
- O'Dell, Doye
- O'Dell, Kenny
- O'Dell, Mac SEE:
- Odim, Tommy SEE: Various Artists (Fortune)
- Oertling, Jim
- Offbeats
- Ogletree, Leo
- O'Gwynn, James
- O'Henry & Barbara
- Oilar, Bev
- O'Keefe, Johnny
- O'Keefe, Larry
- Oklahoma Melody Boys
- Ol' Thoroughbred
- Old Dixie Drifter SEE: Dawson, Jimmie
- Oldham, Doug SEE: Shelton, Curley
- Ole Miss Down Beats
- Olenn, Johnny
- Olive, Monty
- Oliver, Dale
- Oliver, Johnny SEE: Stark, Johnny
- Oliver, Sy SEE: Paul, Bunny
- Oller, Shadie
- Olsen, Jack SEE: Sowell, John
- Olson, Reggie
- Olson, Rocky SEE: Jet Tones
- O'Mary, Slim
- One, Bobby
- O'Neal, Clinton
- O'Neal, Gradie
- O'Neal, Jackie
- O'Neal, Jimmie
- O'Neal, Johnnie SEE: Desert, Johnnie
- O'Neill, Johnny
- Ontario, Art SEE: Buchanan, Art
- Onteare, Troy
- Opkis, Cenith
- Opper, Wolf
- Orbison, Roy
| - Orbit Rockers
- Orbits
- Orbits [2]
- Orbits [3]
- Ordge, Jimmy
- O'Rear, Wayne SEE: Stock, Chat
- Original Casuals SEE: Casuals
- Original Country Gentlemen
- Originales
- Originals
- Orlie & The Saints
- Orr, J.D.
- Orrell, David
- Orsi, Phil
- Osborn, Bobby
- Osborn, Dave
- Osborne, Arthur
- Osborne, Billy
- Osborne, Jimmie SEE:
- Osborne, Johnny SEE: Loyd, Jay B.
- Osborne, L.C. SEE:
- Osburn, Bobby SEE: Osborn, Bobby
- Oster, Al
- Ott, Margaret Ann SEE: Ott, Paul
- Ott, Paul
- Ottey, Kenny
- Ouderkirk, Ron
- Ougie & The Ougouts
- Outer Limits
- Outlaws
- Overholt, Ray SEE:
- Owen, Fuzzy
- Owen, Jim
- Owen, Kenny
- Owen, Mack
- Owen, Rudy
- Owens, Buck
- Owens, Clyde
- Owens, Dawn
- Owens, Don
- Owens, Donnie
- Owens, Dusty
- Owens, Glen
- Owens, Jack
- Owens, Jay & Elizabeth SEE:
- Owens, Kenny SEE: Owen, Kenny
- Owens, Robert SEE: Earl, Little Billy
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