| The Bill | |
|---|---|
| Series 21 | |
 Series 21 DVD cover | |
| No. of episodes | 106 |
| Release | |
| Original network | ITV |
| Original release | 5 January – 29 December 2005 |
| Series chronology | |
Series 21 of British television drama The Bill was broadcast from 5 January until 29 December 2005. The series consisted of 106 episodes, making it the series with the highest number of episodes in the show's final decade, tied with series 19. On 5 February 2014, the complete series was released on DVD in Australia as a Region 0, playable anywhere in the world.