These hits topped the Ultratop 50 in the Flanders region of Belgium in 1990.[1]
| Date | Artist | Title |
|---|---|---|
| January 6 | Phil Collins | "Another Day in Paradise" |
| January 13 | ||
| January 20 | ||
| January 27 | ||
| February 3 | Lisa Stansfield | "All Around the World" |
| February 10 | Clouseau | "Daar Gaat Ze" |
| February 17 | ||
| February 24 | Technotronic | "Get Up! (Before the Night Is Over)" |
| March 3 | ||
| March 10 | ||
| March 17 | Sinéad O'Connor | "Nothing Compares 2 U" |
| March 24 | ||
| March 31 | ||
| April 7 | ||
| April 14 | ||
| April 21 | ||
| April 28 | Michael Bolton | "How Am I Supposed to Live Without You" |
| May 5 | ||
| May 12 | Guru Josh | "Infinity" |
| May 19 | Madonna | "Vogue" |
| May 26 | Vaya Con Dios | "What's a Woman?" |
| June 2 | ||
| June 9 | ||
| June 16 | ||
| June 23 | ||
| June 30 | ||
| July 7 | ||
| July 14 | ||
| July 21 | Gary Moore | "Still Got the Blues" |
| July 28 | ||
| August 4 | Adamski & Seal | "Killer" |
| August 11 | ||
| August 18 | MC Hammer | "U Can't Touch This" |
| August 25 | ||
| September 1 | ||
| September 8 | ||
| September 15 | ||
| September 22 | London Beat | "I've Been Thinking About You" |
| September 29 | Lorca | "Ritmo de la noche" |
| October 6 | ||
| October 13 | London Beat | "I've Been Thinking About You" |
| October 20 | ||
| October 27 | Matthias Reim | "Verdammt, ich lieb' dich" |
| November 3 | ||
| November 10 | ||
| November 17 | ||
| November 24 | ||
| December 1 | Maria McKee | "Show Me Heaven" |
| December 8 | ||
| December 15 | ||
| December 22 | ||
| December 29 | Enigma | "Sadeness (Part I)" |