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The Mainstream Top 40 chart ranks the top-performing singles on contemporary hit radio, compiled by Nielsen SoundScan based collectively on each single's weekly airplay, and published in Billboard magazine. The following are the songs which reached number one on the chart during the year 2008 in chronological order.
During 2008, a total of 14 singles hit number-one on the charts.
| Issue date | Song | Artist(s) | Ref. |
|---|---|---|---|
| January 5 | "Apologize" | Timbaland presents OneRepublic | [1] |
| January 12 | "No One" | Alicia Keys | [2] |
| January 19 | [3] | ||
| January 26 | [4] | ||
| February 2 | [5] | ||
| February 9 | [6] | ||
| February 16 | "Low" | Flo Rida featuring T-Pain | [7] |
| February 23 | [8] | ||
| March 1 | [9] | ||
| March 8 | [10] | ||
| March 15 | [11] | ||
| March 22 | [12] | ||
| March 29 | "With You" | Chris Brown | [13] |
| April 5 | [14] | ||
| April 12 | "Love Song" | Sara Bareilles | [15] |
| April 19 | [16] | ||
| April 26 | [17] | ||
| May 3 | "Bleeding Love" | Leona Lewis | [18] |
| May 10 | [19] | ||
| May 17 | [20] | ||
| May 24 | [21] | ||
| May 31 | [22] | ||
| June 7 | [23] | ||
| June 14 | [24] | ||
| June 21 | [25] | ||
| June 28 | [26] | ||
| July 5 | "Take a Bow" | Rihanna | [27] |
| July 12 | [28] | ||
| July 19 | [29] | ||
| July 26 | "Leavin'" | Jesse McCartney | [30] |
| August 2 | [31] | ||
| August 9 | [32] | ||
| August 16 | [33] | ||
| August 23 | [34] | ||
| August 30 | "Forever" | Chris Brown | [35] |
| September 6 | [36] | ||
| September 13 | [37] | ||
| September 20 | [38] | ||
| September 27 | [39] | ||
| October 4 | "Disturbia" | Rihanna | [40] |
| October 11 | [41] | ||
| October 18 | [42] | ||
| October 25 | "So What" | Pink | [43] |
| November 1 | [44] | ||
| November 8 | [45] | ||
| November 15 | [46] | ||
| November 22 | [47] | ||
| November 29 | "Hot n Cold" | Katy Perry | [48] |
| December 6 | [49] | ||
| December 13 | [50] | ||
| December 20 | "I'm Yours" | Jason Mraz | [51] |
| December 27 | "Live Your Life" | T.I. featuring Rihanna | [52] |