These are the Billboard adult contemporary chart number-one hits of 1989.
| Issue Date | Song | Artist |
|---|---|---|
| January 7 | "Two Hearts" | Phil Collins |
| January 14 | ||
| January 21 | ||
| January 28 | "As Long as You Follow" | Fleetwood Mac |
| February 4 | "Holding On" | Steve Winwood |
| February 11 | ||
| February 18 | "When I'm with You" | Sheriff |
| February 25 | "The Living Years" | Mike + The Mechanics |
| March 4 | ||
| March 11 | ||
| March 18 | ||
| March 25 | "You Got It" | Roy Orbison |
| April 1 | ||
| April 8 | "Eternal Flame" | The Bangles |
| April 15 | ||
| April 22 | "After All" | Cher and Peter Cetera |
| April 29 | ||
| May 6 | ||
| May 13 | ||
| May 20 | "Second Chance" | .38 Special |
| May 27 | ||
| June 3 | "Miss You Like Crazy" | Natalie Cole |
| June 10 | "Everlasting Love" | Howard Jones |
| June 17 | ||
| June 24 | "If You Don't Know Me by Now" | Simply Red |
| July 1 | ||
| July 8 | ||
| July 15 | ||
| July 22 | ||
| July 29 | ||
| August 5 | "Right Here Waiting" | Richard Marx |
| August 12 | ||
| August 19 | ||
| August 26 | ||
| September 2 | ||
| September 9 | ||
| September 16 | "One" | Bee Gees |
| September 23 | ||
| September 30 | "If I Could Turn Back Time" | Cher |
| October 7 | "Cherish" | Madonna |
| October 14 | ||
| October 21 | "Healing Hands" | Elton John |
| October 28 | "Don't Know Much" | Linda Ronstadt and Aaron Neville |
| November 4 | ||
| November 11 | ||
| November 18 | ||
| November 25 | ||
| December 2 | "Another Day in Paradise" | Phil Collins |
| December 9 | ||
| December 16 | ||
| December 23 | ||
| December 30 |
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