The Best '03–'09
The Best is Yūko Andō's first compilation album, released on April 15, 2009. It was released in two formats: 2CD and CD+DVD. All the songs were re-mastered by Ted Jensen.
Charts
Oricon Sales Chart
| Release | Chart | Peak Position | First Day/Week Sales | Sales Total | Chart Run |
| April 15, 2009 | Oricon Daily Albums Chart | 3 | 5,201 | ||
| April 15, 2009 | Oricon Weekly Albums Chart | 5 | 16,230 | 28,694+ | 5 weeks+ |
| April 15, 2009 | Oricon Monthly Albums Chart | ||||
| April 15, 2009 | Oricon Yearly Albums Chart |
Physical Sales Charts
| Chart | Peak position |
| Billboard Japan TOP Albums | |
| Soundscan Albums Chart | 15 |
| Soundscan Albums Chart | 17 |