These hits topped the Ultratop 50 charts in 2003 (see 2003 in music).[1]
| Issue Date | Artist | Title | |
|---|---|---|---|
| January 4 | "Lose Yourself" | ||
| January 11 | Eminem | "Lose Yourself" | |
| January 18 | Eminem | "Lose Yourself" | |
| January 25 | Jasper Steverlinck & Steven & Stijn Kolacny | "Life on Mars?" | |
| February 1 | Jasper Steverlinck & Steven & Stijn Kolacny | "Life on Mars" | |
| February 8 | Jasper Steverlinck & Steven & Stijn Kolacny | "Life on Mars" | |
| February 15 | Jasper Steverlinck & Steven & Stijn Kolacny | "Life on Mars" | |
| February 22 | Jasper Steverlinck & Steven & Stijn Kolacny | "Life on Mars" | |
| March 1 | Jasper Steverlinck & Steven & Stijn Kolacny | "Life on Mars" | |
| March 8 | Jasper Steverlinck & Steven & Stijn Kolacny | "Life on Mars" | |
| March 15 | Jasper Steverlinck & Steven & Stijn Kolacny | "Life on Mars" | |
| March 22 | "I Drove All Night" | ||
| March 29 | Spring | "Spring" | |
| April 5 | Spring | "Spring" | |
| April 12 | Spring | "Spring" | |
| April 19 | Spring | "Spring" | |
| April 26 | Spring | "Spring" | |
| May 3 | Spring | "Spring" | |
| May 10 | Spring | "Spring" | |
| May 17 | Spring | "Spring" | |
| May 24 | "For You" | ||
| May 31 | Peter Evrard | "For You" | |
| June 7 | Peter Evrard | "For You" | |
| June 14 | The Underdog Project and The Sunclub | "Summer Jam 2003" | |
| June 21 | The Underdog Project and The Sunclub | "Summer Jam 2003" | |
| June 28 | The Underdog Project and The Sunclub | "Summer Jam 2003" | |
| July 5 | The Underdog Project and The Sunclub | "Summer Jam 2003" | |
| July 12 | The Underdog Project and The Sunclub | "Summer Jam 2003" | |
| July 19 | The Underdog Project and The Sunclub | "Summer Jam 2003" | |
| July 26 | The Underdog Project and The Sunclub | "Summer Jam 2003" | |
| August 2 | The Underdog Project and The Sunclub | "Summer Jam 2003" | |
| August 9 | The Underdog Project and The Sunclub | "Summer Jam 2003" | |
| August 16 | "Allemaal" | ||
| August 23 | Wim Soutaer | "Allemaal" | |
| August 30 | "Turn the Music Up" | ||
| September 6 | Brahim | "Turn the Music Up" | |
| September 13 | Wim Soutaer | "Allemaal" | |
| September 20 | Brahim | "Turn the Music Up" | |
| September 27 | "Never Leave You (Uh Oooh, Uh Oooh)" | ||
| October 4 | "Where Is the Love?" | ||
| October 11 | The Black Eyed Peas | "Where Is the Love?" | |
| October 18 | The Black Eyed Peas | "Where Is the Love?" | |
| October 25 | The Black Eyed Peas | "Where Is the Love?" | |
| November 1 | "You Are the Reason" | ||
| November 8 | Sarah & Koen Wauters | "You Are the Reason" | |
| November 15 | Sarah & Koen Wauters | "You Are the Reason" | |
| November 22 | Sarah & Koen Wauters | "You Are the Reason" | |
| November 29 | Sarah & Koen Wauters | "You Are the Reason" | |
| December 6 | "I've Only Begun to Fight" | ||
| December 13 | Natalia | "I've Only Begun to Fight" | |
| December 20 | "Shut Up" | ||
| December 27 | The Black Eyed Peas | "Shut Up" |