This is a list of songs that reached number one on the Billboard magazine Streaming Songs chart in 2019.
| † | Indicates best-charting streaming song of 2019 [1] | 
| Issue date | Song | Artist(s) | Weekly streams | 
|---|---|---|---|
| January 5 | "All I Want for Christmas Is You" | Mariah Carey | 51.9 million [2] | 
| January 12 | "Sicko Mode" | Travis Scott | 43.1 million [3] | 
| January 19 | "Sunflower" | Post Malone and Swae Lee | 47.6 million [4] | 
| January 26 | 52.8 million [5] | ||
| February 2 | "7 Rings" | Ariana Grande | 85.3 million [6] | 
| February 9 | 63.2 million [7] | ||
| February 16 | 57.7 million [8] | ||
| February 23 | 63.5 million [9] | ||
| March 2 | 44.5 million [10] | ||
| March 9 | 43.9 million [11] | ||
| March 16 | "Sucker" | Jonas Brothers | 43.7 million [12] | 
| March 23 | "7 Rings" | Ariana Grande | 36.9 million [13] | 
| March 30 | 36.6 million [14] | ||
| April 6 | "Sunflower" | Post Malone and Swae Lee | 38.7 million [15] | 
| April 13 | "Old Town Road" † | Lil Nas X | 46.6 million [16] | 
| April 20 | Lil Nas X featuring Billy Ray Cyrus | 143 million [17] | |
| April 27 | 125.2 million [18] | ||
| May 4 | 114.4 million [19] | ||
| May 11 | 104 million [20] | ||
| May 18 | 104.1 million [21] | ||
| May 25 | 103.1 million [22] | ||
| June 1 | 130.7 million [23] | ||
| June 8 | 115.3 million [24] | ||
| June 15 | 115.6 million [25] | ||
| June 22 | 100 million [26] | ||
| June 29 | 91.6 million [27] | ||
| July 6 | 88.7 million [28] | ||
| July 13 | 89.3 million [29] | ||
| July 20 | 70.5 million [30] | ||
| July 27 | 86.2 million [31] | ||
| August 3 | 72.5 million [32] | ||
| August 10 | 67.4 million [33] | ||
| August 17 | 58.8 million [34] | ||
| August 24 | 53.1 million [35] | ||
| August 31 | "Ransom" | Lil Tecca | 52.3 million [36] | 
| September 7 | 49.7 million [37] | ||
| September 14 | 49.4 million [38] | ||
| September 21 | 46.7 million [39] | ||
| September 28 | 45 million [40] | ||
| October 5 | 45.8 million [41] | ||
| October 12 | 43.1 million [42] | ||
| October 19 | "Highest in the Room" | Travis Scott | 59 million [43] | 
| October 26 | 37.2 million [44] | ||
| November 2 | 33.8 million [45] | ||
| November 9 | "Lose You to Love Me" | Selena Gomez | 38.8 million [46] | 
| November 16 | "Bandit" | Juice Wrld and YoungBoy Never Broke Again | [47] | 
| November 23 | "Woah" | Lil Baby | 24 million [48] | 
| November 30 | "Roxanne" | Arizona Zervas | 29.9 million [49] | 
| December 7 | 36.6 million [50] | ||
| December 14 | "All I Want for Christmas Is You" | Mariah Carey | 35.1 million [51] | 
| December 21 | 45.6 million [52] | ||
| December 28 | 54.4 million [53] |