The 2019–20 Boston Celtics season was the 74th season of the franchise in the National Basketball Association (NBA). This was the team's seventh season under head coach Brad Stevens.
After losing Kyrie Irving and Al Horford to free agency, the Celtics signed former Charlotte Hornets All-Star Kemba Walker and former New York Knicks and Portland Trail Blazers center Enes Kanter in the offseason. The season was suspended by league officials following the games of March 11 due to the COVID-19 pandemic. On March 19, Marcus Smart announced that he tested positive for COVID-19.
On June 4, the Celtics were one of 22 teams invited to the NBA Bubble. In the first round of the NBA playoffs, the Celtics defeated the No. 6 seeded Philadelphia 76ers in four games. The team defeated the No. 2 seeded and NBA champion Toronto Raptors in seven games in the Eastern Conference semifinals. However, the Celtics lost to the fifth-seeded Miami Heat in the Eastern Conference finals in six games.
Draft picks
The Boston Celtics hold 3 first round picks and a second round pick for the 2019 NBA Draft. The 14th pick was transferred from the Sacramento Kings as it failed to reach the 1st pick.
Roster
Standings
Division
Conference
Game log
Preseason
|- style="background:#cfc" | 1 | October 6 | Charlotte | | Jayson Tatum (20) | Grant Williams (9) | Kemba Walker (4) | TD Garden18,624 | 1–0 |- style="background:#cfc" | 2 | October 11 | @ Orlando | | Jayson Tatum (15) | Daniel Theis (9) | Wanamaker, Smart (4) | Amway Center17,354 | 2–0 |- style="background:#cfc" | 3 | October 13 | Cleveland | | Max Strus (14) | Jayson Tatum (9) | Tremont Waters (4) | TD Garden18,624 | 3–0 |- style="background:#cfc" | 4 | October 15 | @ Cleveland | | Carsen Edwards (30) | Javonte Green (9) | Tremont Waters (7) | Rocket Mortgage FieldHouse12,398 | 4–0
Regular season
|- style="background:#fcc;" | 1 | October 23 | @ Philadelphia | | Gordon Hayward (25) | Jayson Tatum (10) | Marcus Smart (6) | Wells Fargo Center20,422 | 0–1 |- style="background:#cfc;" | 2 | October 25 | Toronto | | Tatum, Brown (25) | Tatum, Brown (9) | Tatum, Brown, G.Williams (4) | TD Garden18,624 | 1–1 |- style="background:#cfc;" | 3 | October 26 | @ New York | | Kemba Walker (32) | Jayson Tatum (9) | Smart, Walker (4) | Madison Square Garden19,812 | 2–1 |- style="background:#cfc;" | 4 | October 30 | Milwaukee | | Kemba Walker (32) | Gordon Hayward (10) | Gordon Hayward (7) | TD Garden18,624 | 3–1
|- style="background:#cfc;" | 5 | November 1 | New York | | Kemba Walker (33) | Gordon Hayward (9) | Kemba Walker (5) | TD Garden18,624 | 4–1 |- style="background:#cfc;" | 6 | November 5 | @ Cleveland | | Gordon Hayward (39) | Daniel Theis (9) | Gordon Hayward (8) | Rocket Mortgage FieldHouse17,709 | 5–1 |- style="background:#cfc;" | 7 | November 7 | @ Charlotte | | Jayson Tatum (23) | Gordon Hayward (10) | Hayward, Walker (6) | Spectrum Center18,487 | 6–1 |- style="background:#cfc;" | 8 | November 9 | @ San Antonio | | Jaylen Brown (30) | Tatum, Brown, Williams III (7) | Kemba Walker (8) | AT&T Center18,354 | 7–1 |- style="background:#cfc;" | 9 | November 11 | Dallas | | Kemba Walker (29) | Jaylen Brown (11) | Marcus Smart (6) | TD Garden18,624 | 8–1 |- style="background:#cfc;" | 10 | November 13 | Washington | | Kemba Walker (25) | Enes Kanter (9) | Smart, Walker, Wanamaker (5) | TD Garden19,156 | 9–1 |- style="background:#cfc;" | 11 | November 15 | @ Golden State | | Jayson Tatum (24) | Brown, Tatum (8) | Kemba Walker (5) | Chase Center18,064 | 10–1 |- style="background:#fcc;" | 12 | November 17 | @ Sacramento | | Jaylen Brown (18) | Daniel Theis (10) | Smart, Walker (9) | Golden 1 Center16,633 | 10–2 |- style="background:#cfc;" | 13 | November 18 | @ Phoenix | | Jayson Tatum (26) | Theis, Tatum (11) | Brad Wanamaker (6) | Talking Stick Resort Arena15,193 | 11–2 |- style="background:#fcc;" | 14 | November 20 | @ L. A. Clippers | | Jayson Tatum (30) | Daniel Theis (14) | Marcus Smart (8) | Staples Center19,068 | 11–3 |- style="background:#fcc;" | 15 | November 22 | @ Denver | | Jaylen Brown (22) | Jaylen Brown (10) | Brown, Wanamaker (4) | Pepsi Center19,520 | 11–4 |- style="background:#cfc;" | 16 | November 25 | Sacramento | | Jaylen Brown (24) | Enes Kanter (9) | Marcus Smart (7) | TD Garden19,156 | 12–4 |- style="background:#cfc;" | 17 | November 27 | Brooklyn | | Kemba Walker (39) | Jaylen Brown (10) | Smart, Tatum (5) | TD Garden19,156 | 13–4 |- style="background:#fcc;" | 18 | November 29 | @ Brooklyn | | Jayson Tatum (26) | Jayson Tatum (9) | Kemba Walker (6) | Barclays Center17,732 | 13–5