These are the Billboard Hot Adult Contemporary Tracks number-one hits of 2009.
| Issue Date | Song | Artist |
|---|---|---|
| January 3 | "A Baby Changes Everything" | Faith Hill |
| January 10 | "The Time of My Life" | David Cook |
| January 17 | ||
| January 24 | ||
| January 31 | ||
| February 7 | "Viva la Vida" | Coldplay |
| February 14 | "I'm Yours" | Jason Mraz |
| February 21 | ||
| February 28 | ||
| March 7 | ||
| March 14 | ||
| March 21 | ||
| March 28 | ||
| April 4 | ||
| April 11 | ||
| April 18 | ||
| April 25 | ||
| May 2 | ||
| May 9 | ||
| May 16 | ||
| May 23 | ||
| May 30 | ||
| June 6 | "Love Story" | Taylor Swift |
| June 13 | ||
| June 20 | ||
| June 27 | ||
| July 4 | ||
| July 11 | ||
| July 18 | "The Climb" | Miley Cyrus |
| July 25 | ||
| August 1 | ||
| August 8 | ||
| August 15 | ||
| August 22 | ||
| August 29 | ||
| September 5 | ||
| September 12 | ||
| September 19 | ||
| September 26 | ||
| October 3 | ||
| October 10 | ||
| October 17 | ||
| October 24 | ||
| October 31 | "You Belong with Me" | Taylor Swift |
| November 7 | ||
| November 14 | ||
| November 21 | ||
| November 28 | ||
| December 5 | ||
| December 12 | ||
| December 19 | ||
| December 26 |
|
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