Number-one albums of 2003 (Ireland)
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These are the Irish Recorded Music Association's number one albums of 2003, per the Top 100 Individual Artist Albums chart.
| Issue Date | Album | Artist |
| January 2 | Let Go | Avril Lavigne |
| January 9 | M!ssundaztood | P!nk |
| January 16 | Let Go | Avril Lavigne |
| January 23 | Let Go | Avril Lavigne |
| January 30 | Justified | Justin Timberlake |
| February 6 | Justified | Justin Timberlake |
| February 13 | 100th Window | Massive Attack |
| February 20 | Come Away with Me | Norah Jones |
| February 27 | Come Away with Me | Norah Jones |
| March 6 | Come Away with Me | Norah Jones |
| March 13 | Come Away with Me | Norah Jones |
| March 20 | Come Away with Me | Norah Jones |
| March 27 | Meteora | Linkin Park |
| April 3 | Come Away with Me | Norah Jones |
| April 10 | Come Away with Me | Norah Jones |
| April 17 | Come Away with Me | Norah Jones |
| April 24 | Come Away with Me | Norah Jones |
| May 1 | Justified | Justin Timberlake |
| May 8 | Justified | Justin Timberlake |
| May 15 | Justified | Justin Timberlake |
| May 22 | Set List | The Frames |
| May 29 | Set List | The Frames |
| June 3 | You Gotta Go There to Come Back | Stereophonics |
| June 12 | Hail to the Thief | Radiohead |
| June 19 | St. Anger | Metallica |
| June 26 | Dangerously in Love | Beyoncé |
| July 3 | So Much for the City | The Thrills |
| July 10 | So Much for the City | The Thrills |
| July 17 | So Much for the City | The Thrills |
| July 24 | So Much for the City | The Thrills |
| July 31 | So Much for the City | The Thrills |
| August 7 | So Much for the City | The Thrills |
| August 14 | Sometimes Right, Sometimes Wrong | Mickey Joe Harte |
| August 21 | Sometimes Right, Sometimes Wrong | Mickey Joe Harte |
| August 28 | Sometimes Right, Sometimes Wrong | Mickey Joe Harte |
| September 4 | So Much for the City | The Thrills |
| September 11 | Square 1 | David Kitt |
| September 18 | Square 1 | David Kitt |
| September 25 | Square 1 | David Kitt |
| October 2 | Life for Rent | Dido |
| October 9 | Life for Rent | Dido |
| October 16 | Life for Rent | Dido |
| October 23 | Life for Rent | Dido |
| October 30 | In Time - The Best of R.E.M. 1988-2003 | R.E.M. |
| November 6 | In Time - The Best of R.E.M. 1988-2003 | R.E.M. |
| November 13 | In Time - The Best of R.E.M. 1988-2003 | R.E.M. |
| November 20 | In Time - The Best of R.E.M. 1988-2003 | R.E.M. |
| November 27 | Turnaround | Westlife |
| December 4 | Turnaround | Westlife |
| December 11 | Number Ones | Michael Jackson |
| December 18 | Life for Rent | Dido |
| December 25 | Life for Rent | Dido |
