These hits topped the Ultratop 50 in the Flanders region of Belgium in 1990.[1]
| Date | Artist | Title | |
|---|---|---|---|
| January 6 | "Another Day in Paradise" | ||
| January 13 | |||
| January 20 | |||
| January 27 | |||
| February 3 | "All Around the World" | ||
| February 10 | "Daar Gaat Ze" | ||
| February 17 | |||
| February 24 | "Get Up! (Before the Night Is Over)" | ||
| March 3 | |||
| March 10 | |||
| March 17 | "Nothing Compares 2 U" | ||
| March 24 | |||
| March 31 | |||
| April 7 | |||
| April 14 | |||
| April 21 | |||
| April 28 | "How Am I Supposed to Live Without You" | ||
| May 5 | |||
| May 12 | "Infinity" | ||
| May 19 | "Vogue" | ||
| May 26 | "What's a Woman?" | ||
| June 2 | |||
| June 9 | |||
| June 16 | |||
| June 23 | |||
| June 30 | |||
| July 7 | |||
| July 14 | |||
| July 21 | "Still Got the Blues" | ||
| July 28 | |||
| August 4 | "Killer" | ||
| August 11 | |||
| August 18 | "U Can't Touch This" | ||
| August 25 | |||
| September 1 | |||
| September 8 | |||
| September 15 | |||
| September 22 | "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 | "Verdammt, ich lieb' dich" | ||
| November 3 | |||
| November 10 | |||
| November 17 | |||
| November 24 | |||
| December 1 | "Show Me Heaven" | ||
| December 8 | |||
| December 15 | |||
| December 22 | |||
| December 29 | "Sadeness (Part I)" |