| Grant Williams Rankings 2020-2021 | Stats Glossary  |
| Games with 3 or more Rebounds | Boston Celtics Record : 15 - 18 | Grant Williams |
| No | Date | Game | Res | Score | Rebounds |
| 1 | Jun 1 | at Brooklyn | L | 109-123 | 3 |
| 2 | May 28 | vs Brooklyn | W | 125-119 | 3 |
| 3 | May 16 | at New_York | L | 92-96 | 6 |
| 4 | May 15 | at Minnesota | W | 124-108 | 6 |
| 5 | May 12 | at Cleveland | L | 94-102 | 3 |
| 6 | May 11 | vs Miami | L | 121-129 | 3 |
| 7 | May 5 | at Orlando | W | 132-96 | 3 |
| 8 | Apr 25 | at Charlotte | L | 104-125 | 3 |
| 9 | Apr 23 | at Brooklyn | L | 104-109 | 3 |
| 10 | Apr 15 | at L.A.Lakers | W | 121-113 | 5 |
| 11 | Apr 7 | vs New_York | W | 101-99 | 3 |
| 12 | Mar 29 | vs New_Orleans | L | 109-115 | 5 |
| 13 | Mar 27 | at Oklahoma_City | W | 111-94 | 7 |
| 14 | Mar 26 | at Milwaukee | W | 122-114 | 4 |
| 15 | Mar 24 | at Milwaukee | L | 119-121 | 5 |
| 16 | Mar 21 | vs Orlando | W | 112-96 | 4 |
| 17 | Mar 17 | at Cleveland | L | 110-117 | 7 |
| 18 | Mar 16 | vs Utah | L | 109-117 | 3 |
| 19 | Mar 11 | at Brooklyn | L | 109-121 | 5 |
| 20 | Mar 4 | vs Toronto | W | 132-125 | 4 |
| 21 | Feb 12 | vs Detroit | L | 102-108 | 4 |
| 22 | Feb 9 | at Utah | L | 108-122 | 4 |
| 23 | Feb 5 | at L.A.Clippers | W | 119-115 | 4 |
| 24 | Feb 3 | at Sacramento | L | 111-116 | 5 |
| 25 | Feb 2 | at Golden_State | W | 111-107 | 4 |
| 26 | Jan 27 | at San_Antonio | L | 106-110 | 3 |
| 27 | Jan 25 | at Chicago | W | 119-103 | 4 |
| 28 | Jan 24 | vs Cleveland | W | 141-103 | 3 |
| 29 | Jan 6 | at Miami | W | 107-105 | 6 |
| 30 | Jan 4 | at Toronto | W | 126-114 | 6 |
| 31 | Jan 1 | at Detroit | L | 93-96 | 5 |
| 32 | Dec 27 | at Indiana | L | 107-108 | 4 |
| 33 | Dec 25 | vs Brooklyn | L | 95-123 | 6 |
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