List of Billboard Mainstream Top 40 number-one songs of 2019
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This is a list of songs that reached number one on the Billboard Mainstream Top 40 (or Pop Songs) chart in 2019.
During 2019, a total of 15 singles hit number-one on the charts.
| † | Indicates best-performing single of 2019[1] |
| Issue date | Song | Artist(s) | Ref. |
|---|---|---|---|
| January 5 | "High Hopes" | Panic! at the Disco | [2] |
| January 12 | [3] | ||
| January 19 | [4] | ||
| January 26 | “Thank U, Next” | Ariana Grande | [5] |
| February 2 | "Without Me" † | Halsey | [6] |
| February 9 | [7] | ||
| February 16 | [8] | ||
| February 23 | [9] | ||
| March 2 | "Eastside" | Benny Blanco, Halsey and Khalid | [10] |
| March 9 | "Without Me" † | Halsey | [11] |
| March 16 | "7 Rings" | Ariana Grande | [12] |
| March 23 | [13] | ||
| March 30 | [14] | ||
| April 6 | [15] | ||
| April 13 | [16] | ||
| April 20 | [17] | ||
| April 27 | "Sucker" | Jonas Brothers | [18] |
| May 4 | [19] | ||
| May 11 | [20] | ||
| May 18 | [21] | ||
| May 25 | [22] | ||
| June 1 | [23] | ||
| June 8 | [24] | ||
| June 15 | [25] | ||
| June 22 | "Wow" | Post Malone | [26] |
| June 29 | "Talk" | Khalid | [27] |
| July 6 | [28] | ||
| July 13 | [29] | ||
| July 20 | [30] | ||
| July 27 | "I Don't Care" | Ed Sheeran and Justin Bieber | [31] |
| August 3 | [32] | ||
| August 10 | [33] | ||
| August 17 | "Bad Guy" | Billie Eilish | [34] |
| August 24 | [35] | ||
| August 31 | "Señorita" | Shawn Mendes and Camila Cabello | [36] |
| September 7 | [37] | ||
| September 14 | [38] | ||
| September 21 | [39] | ||
| September 28 | "Truth Hurts" | Lizzo | [40] |
| October 5 | [41] | ||
| October 12 | [42] | ||
| October 19 | [43] | ||
| October 26 | "Someone You Loved" | Lewis Capaldi | [44] |
| November 2 | [45] | ||
| November 9 | [46] | ||
| November 16 | "Circles" | Post Malone | [47] |
| November 23 | [48] | ||
| November 30 | "Good as Hell" | Lizzo | [49] |
| December 7 | [50] | ||
| December 14 | [51] | ||
| December 21 | [52] | ||
| December 28 | "Circles" | Post Malone | [53] |