These hits topped the Ultratop 50 in 1998.[1]
| Date | Artist | Title |
| January 3 | Aqua | "Barbie Girl" |
| January 10 | Aqua | "Barbie Girl" |
| January 17 | Natalie Imbruglia | "Torn" |
| January 24 | Natalie Imbruglia | "Torn" |
| January 31 | Natalie Imbruglia | "Torn" |
| February 7 | Natalie Imbruglia | "Torn" |
| February 14 | Natalie Imbruglia | "Torn" |
| February 21 | Natalie Imbruglia | "Torn" |
| February 28 | Natalie Imbruglia | "Torn" |
| March 7 | Céline Dion | "My heart will go on" |
| March 14 | Céline Dion | "My heart will go on" |
| March 21 | DJ Visage | "Formula" |
| March 28 | DJ Visage | "Formula" |
| April 4 | DJ Visage | "Formula" |
| April 11 | DJ Visage | "Formula" |
| April 18 | Céline Dion | "My heart will go on" |
| April 25 | Céline Dion | "My heart will go on" |
| May 2 | Céline Dion | "My heart will go on" |
| May 9 | Céline Dion | "My heart will go on" |
| May 16 | Céline Dion | "My heart will go on" |
| May 23 | Steps | "Last thing on my mind" |
| May 30 | Steps | "Last thing on my mind" |
| June 6 | Steps | "Last thing on my mind" |
| June 13 | Steps | "Last thing on my mind" |
| June 20 | Steps | "Last thing on my mind" |
| June 27 | Steps | "Last thing on my mind" |
| July 4 | Steps | "Last thing on my mind" |
| July 11 | Steps | "Last thing on my mind" |
| July 18 | Steps | "Last thing on my mind" |
| July 25 | Steps | "Last thing on my mind" |
| August 1 | Pras Michel, ODB & Mýa | "Ghetto Supastar (That Is What You Are)" |
| August 8 | Pras Michel, ODB & Mýa | "Ghetto supastar (that is what you are)" |
| August 15 | Pras Michel, ODB & Mýa | "Ghetto supastar (that is what you are)" |
| August 22 | Pras Michel, ODB & Mýa | "Ghetto supastar (that is what you are)" |
| August 29 | Pras Michel, ODB & Mýa | "Ghetto supastar (that is what you are)" |
| September 5 | Steps | "One For Sorrow" |
| September 12 | Vengaboys | "We like to party (The Vengabus)" |
| September 19 | Vengaboys | "We like to party (The Vengabus)" |
| September 26 | Vengaboys | "We like to party (The Vengabus)" |
| October 3 | Vengaboys | "We like to party (The Vengabus)" |
| October 10 | Vengaboys | "We like to party (The Vengabus)" |
| October 17 | Vengaboys | "We like to party (The Vengabus)" |
| October 24 | Vengaboys | "We like to party (The Vengabus)" |
| October 31 | Scooter | "How Much Is the Fish?" |
| November 7 | Scooter | "How much is the fish" |
| November 14 | Scooter | "How much is the fish" |
| November 21 | Vengaboys | "Boom, Boom, Boom, Boom!!" |
| November 28 | Vengaboys | "Boom boom boom boom" |
| December 5 | Vengaboys | "Boom boom boom boom" |
| December 12 | Cher | "Believe" |
| December 19 | Emilia | "Big Big World" |
| December 26 | Emilia | "Big big world" |