| O Mexico | |
| Written by | Irene Kelley and Michael Joyce |
| Irene Kelley | 2001 | Simple Path |
| Trisha Yearwood | 1995 | Thinking About You |
| Oh Me, Oh My Sweet Baby | |
| Written by | Michael Garvin and Tom Shapiro |
| Diamond Rio | 1992 | Close To The Edge |
| George Strait | 1988 | Beyond The Blue Neon |
| Oh No | |
| Written by | Al Anderson and Mike Lawler |
| Confederate Railroad | 1995 | When And Where |
| 4 Runner | 1995 | 4 Runner |
| Oh Pretty Woman | |
| Written by | Roy Orbison and Bill Dees |
| Arlene Harden | 1970 | |
| Roy Orbison |
||
| Ricky Van Shelton | 1990 | RVS III |
| Old-Fashioned Broken Heart | |
| Written by | Donny Kees and Terri Sharp |
| Dawn Sears | 1991 | What A Woman Wants To Hear |
| Lisa Stewart | 1993 | Lisa Stewart |
| Old Weakness (Coming On Strong) | |
| Written by | Gary Nicholson and Bob DiPiero |
| Patty Loveless | 1994 | When Fallen Angels Fly |
| Delbert McClinton | 1997 | One Of The Fortunate Few |
| Tanya Tucker | 2003 | Tanya |
| On A Bus To St. Cloud | |
| Written by | Gretchen Peters |
| Gretchen Peters | 1996 | The Secret Of Life |
| Trisha Yearwood | 1995 | Thinkin' About You |
| On The Other Hand | |
| Written by | Paul Overstreet and Don Schlitz |
| Paul Overstreet | 1999 | A Songwriter's Project - Volume 1 |
| Randy Travis | 1986 | Storms Of Life |
| Once Upon A Lifetime | |
| Written by | Frank J. Myers and Gary Baker |
| Alabama | 1992 | For The Record |
| Frank Myers |
2006 | Scrapbook |
| Once You've Had The Best | |
| Written by | Johnny Paycheck |
| Alan Jackson | 1999 | Under The Influence |
| George Jones |
1974 |
| One Foot In Front Of The Other | |
| Written by | Lee Roy Parnell and Cris Moore |
| Lee Roy Parnell | 2002 | Everynight's A Saturday Night |
| George Strait | 2006 | It Just Comes Natural |
| One More Time | |
| Written by | Joy Lynn White and Amy Rigby |
| Joy Lynn White | 2002 | On Her Own |
| Joy Lynn White | 2005 | One More Time |
| One Night A Day | |
| Written by | Gary Burr and Pete Wasner |
| Garth Brooks | 1993 | In Pieces |
| Pete Wasner | 1996 | The Names Behind The Artists, Vol. II |
| One Of These Days | |
| Written by | Marcus Hummon, Monty Powell and Kip Raines |
| Marcus Hummon | 1995 | All In Good Time |
| Tim McGraw | 1997 | Everywhere |
| Only Daddy That'll Walk The Line | |
| Written by | Ivory J. Bryant |
| Jim Alley |
1968 | |
| Waylon Jennings |
1968 | |
| The Kentucky Headhunters | 1991 | Electric Barnyard |
| Hank Williams, Jr. | 1979 | Family Tradition |
| Only God Could Stop Me Lovin' You | |
| Written by | Robert John "Mutt" Lange |
| Emerson Drive | 2002 | Emerson Drive |
| Chris Ward | 1996 | One Step Beyond |
| Lari White (with Toby Keith) | 1998 | Stepping Stone |
| Only The Heart | |
| Written by | Karen Staley |
| Ronna Reeves | 1991 | Only The Heart |
| Karen Staley | 1989 | Wildest Dreams |
| The Only Thing That I Have Left | |
| Written by | Clay Blaker |
| Tim McGraw | 1993 | Tim McGraw |
| George Strait | 1982 | Strait From The Heart |
| Open Arms | |
| Written by | Jonathan Cain and Steve Perry |
| The Burch Sisters | 1989 | New Fire |
| Journey |
1981 | Escape |
| Collin Raye | 1997 | The Best Of Collin Raye: Direct Hits |
| Orange Blossom Special | |
| Written by | Ervin T. Rouse |
| Johnny Cash | 1965 | |
| Charlie Daniels | 1996 | The Roots Remain |
| Johnny Darrell | 1974 | |
| Charlie McCoy | 1973 | |
| Mark O'Connor | 1991 | The New Nashville Cats |
| Hank Williams, Jr. | 1983 | Man Of Steel |
| Our Day Will Come | |
| Written by | Mort Garson and Bob Hilliard |
| Pete Anderson | 1994 | Working Class |
| Carpenters | 1973 | Now & Then |
| Our Time Is Coming | |
| Written by | Ronnie Dunn and Kix Brooks |
| Brooks & Dunn | 1993 | Hard Workin' Man |
| Wade Hayes | 1996 | On A Good Night |
| (An) Out Of Control Raging Fire | |
| Written by | Kostas and Melba Montgomery |
| Tracy Byrd (with Dawn Sears) | 1993 | Tracy Byrd |
| Patty Loveless (with Travis Tritt) | 2001 | Mountain Soul |