2018-19シーズンのボストン・セルティックスは全米バスケットボール協会(NBA)のフランチャイズ73年目のシーズン。

レギュラーシーズンではカンファレンス4位、プレーオフではインディアナ・ペイサーズを破り3年連続で準決勝に進出したものの、ヤニス・アデトクンボなどを擁するミルウォーキー・バックスに5試合目で敗退した。

バックスとの準決勝の数日前、セルティックスの球団OBでバスケットボール殿堂のジョン・ハブリチェックが4月25日に79歳で亡くなった。それを受けて、チームはバックスとのシリーズ第1戦に17番と刻んだ白と黒のバンドを着用した。

ヘッドコーチはブラッド・スティーブンス（6シーズン目）、キャプテンはカイリー・アービング、チーム内得点王もアービング。

 ドラフト選考 

 巡 指名順 選手名 ポジション 国籍 出身校など 1 27 ロバート・ウィリアムズ PF テキサスA&M大学

 ロースター 
TW：2way契約
C：チームキャプテン
 ポジション 背番号 名前 身長 体重 出身 C 46 アロン・ベインズ 208cm 118kg ワシントン州立大学 SG/SF 7 ジェイレン・ブラウン 201cm 100kg カリフォルニア大学バークレー校 PG 50 (TW) 198cm 93kg サウスカロライナ大学 PG 1 188cm 84kg ニューメキシコ州立大学 SF 20 ゴードン・ヘイワード 203cm 102kg バトラー大学 PF/C 42 アル・ホーフォード 208cm 111kg フロリダ大学 SG 28 (TW) 196cm 84kg ジョージア州立大学 PG 11 カイリー・アービング(C) 191cm 88kg デューク大学 PF 13 マーカス・モリス 208cm 107kg カンザス大学 PF/SF 37 セミ・オジェレエ 201cm 109kg 南メソジスト大学 PG 12 テリー・ロジアー 185cm 86kg ルイビル大学 SG 36 マーカス・スマート 193cm 100kg オクラホマ州立大学 SF/PF 0 ジェイソン・テイタム 203cm 94kg デューク大学

 レギュラーシーズン成績 
 DR = ディビジョン順位, CR = カンファレンス順位,PCT = 勝率 Z = 全体でホームコートアドバンテージ,ｘ = カンファレンスでホームコートアドバンテージ
 イースタン・カンファレンス アトランティック・ディビジョン DR CR チーム 勝 敗 PCT 1 2 トロント・ラプターズ 5824 0.707 2 3 フィラデルフィア・セブンティシクサーズ5131 0.622 3 4 ボストン・セルティックス4933 0.598 4 6 ブルックリン・ネッツ 4240 0.512 5 15 ニューヨーク・ニックス1765 0.207

試合記録

プレシーズン

|- style="background:#fcc"
| 1
| September 28
| @ Charlotte
| 97–104
| Brown 
| Ojeleye 
| Horford, Irving 
| Dean Smith Center18,081
| 0–1
|- style="background:#bfb"
| 2
| September 30
| Charlotte
| 115–112
| Irving 
| Baynes, Morris 
| Irving, Rozier 
| TD Garden18,624
| 1–1
|- style="background:#fcc"
| 3
| October 2
| Cleveland
| 95–102
| Smart 
| Baynes 
| Horford 
| TD Garden18,624
| 1–2
|- style="background:#fcc"
| 4
| October 6
| @ Cleveland
| 102–113
| Morris, Rozier 
| Baynes 
| Horford 
| Quicken Loans Arena17,083
| 1–3

レギュラーシーズン 

|- style="background:#cfc
| 1
| October 16
| Philadelphia
| 105–87
| Jayson Tatum 
| Marcus Morris 
| Kyrie Irving 
| TD Garden18,624
| 1–0
|- style="background:#fcc
| 2
| October 19
| @ Toronto
| 101–113
| Kyrie Irving 
| Al Horford 
| Kyrie Irving 
| Scotiabank Arena19,800
| 1–1
|- style="background:#cfc
| 3
| October 20
| @ New York
| 103–101
| Jayson Tatum 
| Jayson Tatum 
| Irving, Smart 
| Madison Square Garden19,427
| 2–1
|- style="background:#fcc
| 4
| October 22
| Orlando
| 90–93
| Kyrie Irving 
| Jayson Tatum 
| Kyrie Irving 
| TD Garden18,624
| 2–2
|- style="background:#cfc
| 5
| October 25
| @ Oklahoma City
| 101–95
| Jayson Tatum 
| Marcus Morris 
| Kyrie Irving 
| Chesapeake Energy Arena18,203
| 3–2
|- style="background:#cfc
| 6
| October 27
| @ Detroit
| 109–89
| Jaylen Brown 
| Morris, Theis 
| Marcus Smart 
| Little Caesars Arena18,120
| 4–2
|- style="background:#cfc
| 7
| October 30
| Detroit
| 108–105
| Kyrie Irving 
| Marcus Morris 
| Kyrie Irving 
| TD Garden18,624
| 5–2

|- style="background:#cfc
| 8
| November 1
| Milwaukee
| 117–113
| Kyrie Irving 
| Terry Rozier 
| Al Horford 
| TD Garden18,624
| 6–2
|- style="background:#fcc
| 9
| November 3
| @ Indiana
| 101–102
| Marcus Morris 
| Brown, Hayward 
| Marcus Smart 
| Bankers Life Fieldhouse17,505
| 6–3
|- style="background:#fcc
| 10
| November 5
| @ Denver
| 107–115
| Kyrie Irving 
| Gordon Hayward 
| Al Horford 
| Pepsi Center19,520
| 6–4
|- style="background:#cfc
| 11
| November 8
| @ Phoenix
| 116–109 (OT)
| Kyrie Irving 
| Morris, Tatum 
| Kyrie Irving 
| Talking Stick Resort Arena17,359
| 7–4
|- style="background:#fcc
| 12
| November 9
| @ Utah
| 115–123
| Terry Rozier 
| Terry Rozier 
| Marcus Smart 
| Vivint Smart Home Arena18,306
| 7–5
|- style="background:#fcc
| 13
| November 11
| @ Portland
| 94–100
| Jayson Tatum 
| Gordon Hayward 
| Kyrie Irving 
| Moda Center19,712
| 7–6
|- style="background:#cfc
| 14
| November 14
| Chicago
| 111–82
| Jaylen Brown 
| Aron Baynes 
| Kyrie Irving 
| TD Garden18,624
| 8–6
|- style="background:#cfc
| 15
| November 16
| Toronto
| 123–116 (OT)
| Kyrie Irving 
| Al Horford 
| Kyrie Irving 
| TD Garden18,624
| 9–6
|- style="background:#fcc
| 16
| November 17
| Utah
| 86–98
| Kyrie Irving 
| Kyrie Irving 
| Hayward, Smart, Rozier 
| TD Garden18,624
| 9–7
|-style="background:#fcc
| 17
| November 19
| @ Charlotte
| 112–117
| Kyrie Irving 
| Gordon Hayward 
| Kyrie Irving 
| Spectrum Center18,040
| 9–8
|-style="background:#fcc
| 18
| November 21
| New York
| 109–117
|Kyrie Irving 
|Morris, Tatum 
|Kyrie Irving 
| TD Garden18,624
| 9–9
|-style="background:#cfc
| 19
| November 23
| @ Atlanta
|114–96
| Aron Baynes 
| Aron Baynes 
| Marcus Smart 
| State Farm Arena15,017
| 10–9
|- style="background:#fcc;"
| 20
| November 24
| @ Dallas
| 104–113
| Jayson Tatum 
| Aron Baynes 
| Kyrie Irving 
| American Airlines Center20,226
| 10–10
|- style="background:#cfc;"
| 21
| November 26
| @ New Orleans
| 124–107
| Kyrie Irving 
| Marcus Morris 
| Kyrie Irving 
| Smoothie King Center15,189
| 11–10
|- style="background:#cfc;
| 22
| November 30
| Cleveland
| 128–95
| Kyrie Irving 
| Aron Baynes 
| Marcus Smart 
| TD Garden18,624
| 12–10

|- style="background:#cfc
| 23
| December 1
| @ Minnesota
| 118–109
| Gordon Hayward 
| Jayson Tatum 
| Kyrie Irving 
| Target Center17,663
| 13–10
|- style="background:#cfc
| 24
| December 6
| New York
| 128–100
| Kyrie Irving 
| Al Horford 
| Kyrie Irving 
| TD Garden18,624
| 14–10
|- style="background:#cfc
| 25
| December 8
| @ Chicago
| 133–77
| Jaylen Brown 
| Daniel Theis 
| Gordon Hayward 
| United Center20,923
| 15–10
|- style="background:#cfc
| 26
| December 10
| New Orleans
| 113–100
| Marcus Morris 
| Robert Williams 
| Terry Rozier 
| TD Garden18,624
| 16–10
|- style="background:#cfc
| 27
| December 12
| @ Washington
| 130–125 (OT)
| Kyrie Irving 
| Jayson Tatum 
| Kyrie Irving 
| Capital One Arena20,409
| 17–10
|- style="background:#cfc
| 28
| December 14
| Atlanta
| 129–108
| Kyrie Irving 
| Theis, Rozier 
| Marcus Smart 
| TD Garden18,624
| 18–10
|- style="background:#fcc
| 29
| December 15
| @ Detroit
| 104–113
| Kyrie Irving 
| Irving, Tatum, Smart 
| Kyrie Irving 
| Little Caesars Arena14,500
| 18–11
|- style="background:#fcc
| 30
| December 19
| Phoenix
| 103–111
| Kyrie Irving 
| Williams, Tatum 
| Kyrie Irving 
| TD Garden18,624
| 18–12
|- style="background:#fcc
| 31
| December 21
| Milwaukee
| 107–120
| Jayson Tatum 
| Kyrie Irving 
| Kyrie Irving 
| TD Garden18,624
| 18–13
|- style="background:#cfc
| 32
| December 23
| Charlotte
| 119–103
| Kyrie Irving 
| Marcus Morris 
| Terry Rozier 
| TD Garden18,624
| 19–13
|- style="background:#cfc
| 33
| December 25
| Philadelphia
| 121–114 (OT)
| Kyrie Irving 
| Irving, Tatum 
| Al Horford 
| TD Garden18,624
| 20–13
|- style="background:#fcc
| 34
| December 27
| @ Houston
| 113–127
| Kyrie Irving 
| Morris, Hayward 
| Kyrie Irving 
| Toyota Center18,055
| 20–14
|- style="background:#cfc
| 35
| December 29
| @ Memphis
| 112–103
| Kyrie Irving 
| Jayson Tatum 
| Kyrie Irving 
| FedExForum17,794
| 21–14
|- style="background:#fcc
| 36
| December 31
| @ San Antonio
| 111–120
| Jaylen Brown 
| Jayson Tatum 
| Kyrie Irving 
| AT&T Center18,354
| 21–15

|- style="background:#cfc
| 37
| January 2
| Minnesota
| 115–102
| Gordon Hayward 
| Horford, Brown 
| Marcus Smart 
| TD Garden18,624
| 22–15
|- style="background:#cfc
| 38
| January 4
| Dallas
| 114–93
| Jaylen Brown 
| Daniel Theis 
| Horford, Hayward 
| TD Garden18,624
| 23–15
|- style="background:#cfc;"
| 39
| January 7
| Brooklyn
| 116–95
| Kyrie Irving 
| Al Horford 
| Marcus Smart 
| TD Garden18,624
| 24–15
|- style="background:#cfc;"
| 40
| January 9
| Indiana
| 135–108
| Morris, Brown 
| Marcus Morris 
| Al Horford 
| TD Garden18,624
| 25–15
|- style="background:#fcc;
| 41
| January 10
| @ Miami
| 99–115
| Kyrie Irving 
| Morris, Rozier 
| Kyrie Irving 
| American Airlines Arena19,600
| 25–16
|- style="background:#fcc;
| 42
| January 12
| @ Orlando
| 103–105
| Kyrie Irving 
| Al Horford 
| Kyrie Irving 
| Amway Center18,846
| 25–17
|- style="background:#fcc
| 43
| January 14
| @ Brooklyn
| 102–109
| Jayson Tatum 
| Morris, Brown 
| Terry Rozier 
| Barclays Center16,247
| 25–18
|- style="background:#cfc
| 44
| January 16
| Toronto
| 117–108
| Kyrie Irving 
| Jayson Tatum 
| Kyrie Irving 
| TD Garden18,624
| 26–18
|- style="background:#cfc
| 45
| January 18
| Memphis
| 122–116
| Kyrie Irving 
| Aron Baynes 
| Kyrie Irving 
| TD Garden18,624
| 27–18
|- style="background:#cfc
| 46
| January 19
| @ Atlanta
| 113–105
| Kyrie Irving 
| Al Horford 
| Kyrie Irving 
| State Farm Arena16,626
| 28–18
|- style="background:#cfc
| 47
| January 21
| Miami
| 107–99
| Kyrie Irving 
| Al Horford 
| Kyrie Irving 
| TD Garden18,624
| 29–18
|- style="background:#cfc
| 48
| January 23
| Cleveland
| 123–103
| Terry Rozier 
| Terry Rozier 
| Terry Rozier 
| TD Garden18,624
| 30–18
|- style="background:#fcc
| 49
| January 26
| Golden State
| 111–115
| Kyrie Irving 
| Al Horford 
| Kyrie Irving 
| TD Garden18,624
| 30–19
|- style="background:#cfc
| 50
| January 28
| Brooklyn
| 112–104
| Brown, Smart 
| Al Horford 
| Smart, Rozier 
| TD Garden18,624
| 31–19
|- style="background:#cfc
| 51
| January 30
| Charlotte
| 126–94
| Jaylen Brown 
| Jaylen Brown 
| Terry Rozier 
| TD Garden18,624
| 32–19

|- style="background:#cfc
| 52
| February 1
| @ New York
| 113–99
| Kyrie Irving 
| Kyrie Irving 
| Irving, Rozier 
| Madison Square Garden18,343
| 33–19
|- style="background:#cfc
| 53
| February 3
| Oklahoma City
| 134–129
| Kyrie Irving 
| Morris, Tatum, Rozier 
| Kyrie Irving 
| TD Garden18,624
| 34–19
|- style="background:#cfc
| 54
| February 5
| @ Cleveland
| 103–96
| Jayson Tatum 
| Brown, Tatum 
| Al Horford 
| Quicken Loans Arena19,432
| 35–19
|- style="background:#fcc
| 55
| February 7
| L. A. Lakers
| 128–129
| Kyrie Irving 
| Jayson Tatum 
| Kyrie Irving 
| TD Garden18,624
| 35–20
|- style="background:#fcc
| 56
| February 9
| L. A. Clippers
| 112–123
| Gordon Hayward 
| Jayson Tatum 
| Smart, Horford 
| TD Garden18,624
| 35–21
|- style="background:#cfc
| 57
| February 12
| @ Philadelphia
| 112–109
| Gordon Hayward 
| Jayson Tatum 
| Rozier, Horford 
| Wells Fargo Center20,582
| 36–21
|- style="background:#cfc
| 58
| February 13
| Detroit
| 118–110
| Gordon Hayward 
| Al Horford 
| Hayward, Horford 
| TD Garden18,624
| 37–21
|- align="center"
| colspan="9" style="background:#bbcaff;" | All-Star Break
|- style="background:#fcc
| 59
| February 21
| @ Milwaukee
| 97–98
| Kyrie Irving 
| Al Horford 
| Irving, Horford 
| Fiserv Forum17,926
| 37–22
|- style="background:#fcc
| 60
| February 23
| @ Chicago
| 116–126
| Kyrie Irving 
| Morris, Smart 
| Kyrie Irving 
| United Center21,295
| 37–23
|- style="background:#fcc
| 61
| February 26
| @ Toronto
| 95–118
| Marcus Morris 
| Jaylen Brown 
| Irving, Horford 
| Scotiabank Arena19,800
| 37–24
|- style="background:#fcc
| 62
| February 27
| Portland
| 92–97
| Kyrie Irving 
| Jaylen Brown 
| Smart, Horford 
| TD Garden18,624
| 37–25

|- style="background:#cfc
| 63
| March 1
| Washington
| 107–96
| Al Horford 
| Marcus Morris 
| Kyrie Irving 
| TD Garden18,624
| 38–25
|- style="background:#fcc
| 64
| March 3
| Houston
| 104–115
| Kyrie Irving 
| Kyrie Irving 
| Irving, Smart 
| TD Garden18,624
| 38–26
|- style="background:#cfc
| 65
| March 5
| @ Golden State
| 128–95
| Gordon Hayward 
| Gordon Hayward 
| Kyrie Irving 
| Oracle Arena19,596
| 39–26
|- style="background:#cfc
| 66
| March 6
| @ Sacramento
| 111–109
| Jayson Tatum 
| Al Horford 
| Al Horford 
| Golden 1 Center17,583
| 40–26
|- style="background:#cfc
| 67
| March 9
| @ L. A. Lakers
| 120–107
| Kyrie Irving 
| Al Horford 
| Irving, Smart, Tatum 
| Staples Center18,997
| 41–26
|- style="background:#fcc
| 68
| March 11
| @ L. A. Clippers
| 115–140
| Terry Rozier 
| Jaylen Brown 
| Kyrie Irving 
| Staples Center19,068
| 41–27
|- style="background:#cfc
| 69
| March 14
| Sacramento
| 126–120
| Kyrie Irving 
| Marcus Morris 
| Kyrie Irving 
| TD Garden18,624
| 42–27
|- style="background:#cfc
| 70
| March 16
| Atlanta
| 129–120
| Kyrie Irving 
| Irving, Morris 
| Kyrie Irving 
| TD Garden18,624
| 43–27
|- style="background:#fcc
| 71
| March 18
| Denver
| 105–114
| Kyrie Irving 
| Jayson Tatum 
| Tatum, Horford 
| TD Garden18,624
| 43–28
|- style="background:#fcc
| 72
| March 20
| @ Philadelphia
| 115–118
| Kyrie Irving 
| Irving, Morris 
| Al Horford 
| Wells Fargo Center20,606
| 43–29
|- style="background:#fcc
| 73
| March 23
| @ Charlotte
| 117–124
| Kyrie Irving 
| Marcus Morris 
| Marcus Smart 
| Spectrum Center19,438
| 43–30
|- style="background:#fcc
| 74
| March 24
| San Antonio
| 96–115
| Marcus Smart 
| Gordon Hayward 
| Kyrie Irving 
| TD Garden18,624
| 43–31
|- style="background:#cfc
| 75
| March 26
| @ Cleveland
| 116–106
| Smart, Tatum 
| Al Horford 
| Al Horford 
| Quicken Loans Arena19,432
| 44–31
|- style="background:#cfc
| 76
| March 29
| Indiana
| 114–112
| Kyrie Irving 
| Aron Baynes 
| Marcus Smart 
| TD Garden18,624
| 45–31
|- style="background:#fcc
| 77
| March 30
| @ Brooklyn
| 96–110
| Gordon Hayward 
| Hayward, Brown 
| Terry Rozier 
| Barclays Center17,732
| 45–32

|- style="background:#cfc
| 78
| April 1
| Miami
| 110–105
| Kyrie Irving 
| Baynes, Horford 
| Al Horford 
| TD Garden18,624
| 46–32
|- style="background:#cfc
| 79
| April 3
| @ Miami
| 112–102
| Gordon Hayward 
| Aron Baynes 
| Gordon Hayward 
| American Airlines Arena19,904
| 47–32
|- style="background:#cfc
| 80
| April 5
| @ Indiana
| 117–97
| Jayson Tatum 
| Aron Baynes 
| Kyrie Irving 
| Bankers Life Fieldhouse17,371
| 48–32
|- style="background:#fcc
| 81
| April 7
| Orlando
| 108–116
| Kyrie Irving 
| Marcus Morris 
| Al Horford 
| TD Garden18,624
| 48–33
|- style="background:#cfc
| 82
| April 9
| @ Washington
| 116–110
| Terry Rozier 
| Dozier, Williams 
| Brad Wanamaker 
| Capital One Arena20,409
| 49–33

プレーオフ

|- style="background:#cfc;"
| 1
| April 14
| Indiana
| 84–74
| Irving, Morris 
| Al Horford 
| Kyrie Irving 
| TD Garden18,624
| 1–0
|- style="background:#cfc;"
| 2
| April 17
| Indiana
| 99–91
| Kyrie Irving 
| Al Horford 
| Kyrie Irving 
| TD Garden18,624
| 2–0
|- style="background:#cfc;"
| 3
| April 19
| @ Indiana
| 104–96
| Jaylen Brown 
| Al Horford 
| Kyrie Irving 
| Bankers Life Fieldhouse17,923
| 3–0
|- style="background:#cfc;"
| 4
| April 21
| @ Indiana
| 110–106
| Gordon Hayward 
| Al Horford 
| Kyrie Irving 
| Bankers Life Fieldhouse17,923
| 4–0

|- style="background:#cfc;"
| 1
| April 28
| @ Milwaukee
| 112–90
| Kyrie Irving 
| Al Horford 
| Kyrie Irving 
| Fiserv Forum17,341
| 1–0
|- style="background:#fcc;"
| 2
| April 30
| @ Milwaukee
| 102–123
| Marcus Morris 
| Horford, Rozier 
| Kyrie Irving 
| Fiserv Forum17,536
| 1–1
|- style="background:#fcc;"
| 3
| May 3
| Milwaukee
| 116–123
| Kyrie Irving 
| Jayson Tatum 
| Kyrie Irving 
| TD Garden18,624
| 1–2
|- style="background:#fcc;"
| 4
| May 6
| Milwaukee
| 101–113
| Kyrie Irving 
| Marcus Morris 
| Kyrie Irving 
| TD Garden18,624
| 1–3
|- style="background:#fcc;"
| 5
| May 8
| @ Milwaukee
| 91–116
| Kyrie Irving 
| Marcus Morris 
| Al Horford 
| Fiserv Forum17,701
| 1–4

 各選手個人成績 

レギュラーシーズン

|-
| align="left"|アロン・ベインズ || align="center"| C
| 51 || 18 || 821 || 240 || 57 || 12 || 34 || 284
|-
| align="left"|ジェイレン・ブラウン || align="center"| SG
| 74 || 25 || 1,913 || 313 || 100 || 69 || 32 || 964
|-
| align="left"|P・J・ドジアー || align="center"| SG
| 6 || 0 || 51 || 17 || 5 || 2 || 0 || 19
|-
| align="left"|ゴードン・ヘイワード || align="center"| PF
| 72 || 18 || 1,863 || 322 || 244 || 62 || 23 || 825
|-
| align="left"|アル・ホーフォード || align="center"| C
| 68 || 68 || 1,973 || 458 || 283 || 59 || style=";"|86 || 925
|-
| align="left"|R・J・ハンター≠ || align="center"| SG
| 1 || 0 || 26 || 3 || 3 || 1 || 0 || 17
|-
| align="left"|カイリー・アービング || align="center"| PG
| 67 || 67 || 2,214 || 335 || style=";"|464 || 103 || 34 || style=";"|1,596
|-
| align="left"|グレッグ・モンロー≠ || align="center"| C
| 2 || 0 || 5 || 3 || 1 || 0 || 0 || 6
|-
| align="left"|マーカス・モリス || align="center"| PF
| 75 || 53 || 2,091 || 458 || 109 || 43 || 25 || 1,046
|-
| align="left"|セミ・オジェレエ || align="center"| PF
| 56 || 3 || 594 || 86 || 23 || 10 || 4 || 186
|-
| align="left"|テリー・ロジアー || align="center"| PG
| 79 || 14 || 1,791 || 307 || 231 || 68 || 21 || 708
|-
| align="left"|マーカス・スマート || align="center"| SG
| style=";"|80 || 60 || 2,200 || 234 || 321 || style=";"|143 || 28 || 708
|-
| align="left"|ジェイソン・テイタム || align="center"| SF
| 79 || style=";"|79 || style=";"|2,455 || style=";"|477 || 168 || 84 || 57 || 1,243
|-
| align="left"|ダニエル・タイス || align="center"| C
| 66 || 2 || 908 || 225 || 68 || 21 || 42 || 374
|}
After all games.
‡Waived during the season
†Traded during the season
≠Acquired during the season

 移籍 

 受賞 

 スポーツマンシップ賞 - アル・ホーフォード (最終候補)
 ハッスル賞 - マーカス・スマート
 生涯功労賞 - ラリー・バード
 オールNBAチーム - カイリー・アービング (2ndチーム、2回目)
 オールディフェンシブチーム - マーカス・スマート (1stチーム、初)
 オールスターゲーム選出 - カイリー・アービング (先発、6回目)