This is the RIANZ list of number one albums in New Zealand music charts during 2003, starting from Sunday 12 January.
Grey shading indicates an album of New Zealand origin.
| Week | Title | Artist |
|---|---|---|
| 12 January | The Best of 1990–2000 | U2 |
| 19 January | Brushfire Fairytales | Jack Johnson |
| 26 January | Brushfire Fairytales | Jack Johnson |
| 2 February | 8 Mile | Soundtrack |
| 9 February | 8 Mile | Soundtrack |
| 16 February | 8 Mile | Soundtrack |
| 23 February | Come Away with Me | Norah Jones |
| 2 March | Come Away with Me | Norah Jones |
| 9 March | Come Away with Me | Norah Jones |
| 16 March | Come Away with Me | Norah Jones |
| 23 March | Come Away with Me | Norah Jones |
| 30 March | Come Away with Me | Norah Jones |
| 6 April | Come Away with Me | Norah Jones |
| 13 April | Meteora | Linkin Park |
| 20 April | Meteora | Linkin Park |
| 27 April | Meteora | Linkin Park |
| 4 May | Come Away with Me | Norah Jones |
| 11 May | Come Away with Me | Norah Jones |
| 18 May | Come Away with Me | Norah Jones |
| 25 May | On and On | Jack Johnson |
| 1 June | Beautiful Collision | Bic Runga |
| 8 June | Beautiful Collision | Bic Runga |
| 15 June | Beautiful Collision | Bic Runga |
| 22 June | St. Anger | Metallica |
| 29 June | Beautiful Collision | Bic Runga |
| 6 July | Beautiful Collision | Bic Runga |
| 13 July | Beautiful Collision | Bic Runga |
| 20 July | Love & Disrespect | Elemeno P |
| 27 July | Beautiful Collision | Bic Runga |
| 3 August | Pure | Hayley Westenra |
| 10 August | Pure | Hayley Westenra |
| 17 August | Pure | Hayley Westenra |
| 24 August | Pure | Hayley Westenra |
| 31 August | One Drop East | Salmonella Dub |
| 7 September | Pure | Hayley Westenra |
| 14 September | Michael Bublé | Michael Bublé |
| 21 September | Pure | Hayley Westenra |
| 28 September | Thirteenth Step | A Perfect Circle |
| 5 October | Pure | Hayley Westenra |
| 12 October | Pure | Hayley Westenra |
| 19 October | Life for Rent | Dido |
| 26 October | Pure | Hayley Westenra |
| 2 November | The Crusader | Scribe |
| 9 November | Pure | Hayley Westenra |
| 16 November | What to Do with Daylight | Brooke Fraser |
| 23 November | Pure | Hayley Westenra |
| 30 November | Pure | Hayley Westenra |
| 7 December | Pure | Hayley Westenra |
| 14 December | Pure | Hayley Westenra |
| 21 December | Pure | Hayley Westenra |
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