List of Billboard Hot 100 number ones of 1990

This is a list of the U.S. Billboard magazine Hot 100 number-ones of 1990. The three longest running number-one singles of 1990 are "Nothing Compares 2 U" by Sinéad O'Connor, "Vision of Love" by Mariah Carey, and "Because I Love You (The Postman Song)" by Stevie B, which each attained four weeks at the top of the chart.