These are the Billboard adult contemporary chart number-one hits of 1999.
Billboard is an American entertainment media brand owned by the Billboard-Hollywood Reporter Media Group, a division of Eldridge Industries. It publishes pieces involving news, video, opinion, reviews, events, and style, and is also known for its music charts, including the Hot 100 and Billboard 200, tracking the most popular songs and albums in different genres. It also hosts events, owns a publishing firm, and operates several TV shows.
| Issue Date | Song | Artist |
|---|---|---|
| January 2 | "I'm Your Angel" | R. Kelly & Celine Dion |
| January 9 | ||
| January 16 | ||
| January 23 | ||
| January 30 | ||
| February 6 | ||
| February 13 | ||
| February 20 | ||
| February 27 | ||
| March 6 | "Angel" | Sarah McLachlan |
| March 13 | ||
| March 20 | ||
| March 27 | ||
| April 3 | ||
| April 10 | ||
| April 17 | ||
| April 24 | ||
| May 1 | ||
| May 8 | ||
| May 15 | ||
| May 22 | ||
| May 29 | "You'll Be in My Heart" | Phil Collins |
| June 5 | ||
| June 12 | ||
| June 19 | ||
| June 26 | ||
| July 3 | ||
| July 10 | ||
| July 17 | ||
| July 24 | ||
| July 31 | "I Want It That Way" | Backstreet Boys |
| August 7 | "You'll Be in My Heart" | Phil Collins |
| August 14 | ||
| August 21 | ||
| August 28 | "I Want It That Way" | Backstreet Boys |
| September 4 | "You'll Be in My Heart" | Phil Collins |
| September 11 | ||
| September 18 | ||
| September 25 | ||
| October 2 | "I Want It That Way" | Backstreet Boys |
| October 9 | ||
| October 16 | "You'll Be in My Heart" | Phil Collins |
| October 23 | ||
| October 30 | ||
| November 6 | "I Want It That Way" | Backstreet Boys |
| November 13 | ||
| November 20 | ||
| November 27 | ||
| December 4 | ||
| December 11 | ||
| December 18 | "That's the Way It Is" | Celine Dion |
| December 25 | "I Knew I Loved You" | Savage Garden |
