List of Billboard Mainstream Top 40 number-one songs of 2020
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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 2020.
During 2020, a total of 15 singles hit number-one on the charts.
| † | Indicates best-performing song of 2020[1] |
| Issue date | Song | Artist(s) | Ref. |
|---|---|---|---|
| January 4 | "Circles" | Post Malone | [2] |
| January 11 | [3] | ||
| January 18 | [4] | ||
| January 25 | [5] | ||
| February 1 | [6] | ||
| February 8 | "Memories" | Maroon 5 | [7] |
| February 15 | "Circles" | Post Malone | [8] |
| February 22 | [9] | ||
| February 29 | "Don't Start Now" | Dua Lipa | [10] |
| March 7 | [11] | ||
| March 14 | [12] | ||
| March 21 | [13] | ||
| March 28 | [14] | ||
| April 4 | [15] | ||
| April 11 | "Adore You" | Harry Styles | [16] |
| April 18 | "Blinding Lights" † | The Weeknd | [17] |
| April 25 | [18] | ||
| May 2 | [19] | ||
| May 9 | “My Oh My” | Camila Cabello featuring DaBaby | [20] |
| May 16 | "Say So" | Doja Cat | [21] |
| May 23 | [22] | ||
| May 30 | [23] | ||
| June 6 | [24] | ||
| June 13 | [25] | ||
| June 20 | [26] | ||
| June 27 | "Intentions" | Justin Bieber featuring Quavo | [27] |
| July 4 | "Blinding Lights" † | The Weeknd | [28] |
| July 11 | [29] | ||
| July 18 | [30] | ||
| July 25 | "Falling" | Trevor Daniel | [31] |
| August 1 | "Break My Heart" | Dua Lipa | [32] |
| August 8 | "Watermelon Sugar" | Harry Styles | [33] |
| August 15 | [34] | ||
| August 22 | [35] | ||
| August 29 | [36] | ||
| September 5 | [37] | ||
| September 12 | [38] | ||
| September 19 | [39] | ||
| September 26 | "Before You Go" | Lewis Capaldi | [40] |
| October 3 | "Savage Love (Laxed – Siren Beat)" | Jawsh 685 and Jason Derulo | [41] |
| October 10 | [42] | ||
| October 17 | [43] | ||
| October 24 | [44] | ||
| October 31 | "Mood" | 24kGoldn and Iann Dior | [45] |
| November 7 | [46] | ||
| November 14 | [47] | ||
| November 21 | [48] | ||
| November 28 | [49] | ||
| December 5 | [50] | ||
| December 12 | [51] | ||
| December 19 | [52] | ||
| December 26 | "Positions" | Ariana Grande | [53] |