| Official |
|---|
| 1.1 | If I Only Knew (LP version) | 4:09 | Tom Jones | If I Only Knew | |
| 1.1 | If I Only Knew | 4:09 | Tom Jones | The Lead and How to Swing It | |
| 1.1 | If I Only Knew | 4:08 | Tom Jones | The Lead and How to Swing It | |
| 1.1 | If I Only Knew | 4:08 | Tom Jones | The Lead and How to Swing It | |
| 1.3 | If I Only Knew | 4:08 | Tom Jones | Hot Hits [TL 541/25] | |
| 2.10 | If I Only Knew | 4:08 | Tom Jones | The Awards 1995 | |
| 2.16 | If I Only Knew | 4:08 | Tom Jones | The Best Ever Nineties Album | |
| 1.23 | If I Only Knew | 4:09 | Tom Jones | Gold: Greatest Hits | |
| 1.14 | If I Only Knew | 4:02 | Tom Jones | Greatest Hits | |
| 1.2 | If I Only Knew | 4:07 | Tom Jones | MM2003: Jääkiekon MM-kisojen virallinen kisalevy | |
| 1.9 | If I Only Knew | 4:08 | Tom Jones | Cheer up!! For your positive life | |
| 4.6 | If I Only Knew | 4:07 | Tom Jones | The Definitive: 1964–2002 | |
| 1.23 | If I Only Knew | 4:09 | Tom Jones | Gold: Greatest Hits | |
| 1.19 | If I Only Knew | 4:02 | Tom Jones | Greatest Hits | |
| 1.13 | If I Only Knew | 4:02 | Tom Jones | Greatest Hits: The Platinum Edition | |
| 1.17 | If I Only Knew | 4:05 | Tom Jones | Music From and Inspired by the Film Alien Autopsy | |
| 1.13 | If I Only Knew | 4:01 | Tom Jones | Pozytywne Wibracje, Volume 10 | |
| 1.11 | If I Only Knew | 4:02 | Tom Jones | Greatest Hits Rediscovered | - 2010-11-08 GB
- 2010-12-03 DE
|
| 1.1 | If I Only Knew | 4:11 | Tom Jones | The Lead and How to Swing It | |
| Promotion |
|---|
| 1.6 | If I Only Knew | 4:08 | Tom Jones | Music, the Natural Choice: Spread the Jam #16 | |
| Bootleg |
|---|
| 2.2 | If I Only Knew | ?:?? | Tom Jones | Greatest Hits | |
| (unknown) |
|---|
| 1.14 | If I Only Knew | 4:05 | Tom Jones | Best | |
