| Robert Williams III Rankings 2020-2021 | Stats Glossary  |
| Games with 3 or more Offensive Rebounds | Boston Celtics Record : 17 - 11 | Robert Williams III |
| No | Date | Game | Res | Score | Offensive Rebounds |
| 1 | May 25 | at Brooklyn | L | 108-130 | 3 |
| 2 | May 22 | at Brooklyn | L | 93-104 | 5 |
| 3 | May 5 | at Orlando | W | 132-96 | 3 |
| 4 | Apr 30 | vs San_Antonio | W | 143-140 | 3 |
| 5 | Apr 28 | vs Charlotte | W | 120-111 | 5 |
| 6 | Apr 11 | at Denver | W | 105-87 | 3 |
| 7 | Apr 7 | vs New_York | W | 101-99 | 5 |
| 8 | Apr 4 | vs Charlotte | W | 116-86 | 4 |
| 9 | Apr 2 | vs Houston | W | 118-102 | 4 |
| 10 | Mar 29 | vs New_Orleans | L | 109-115 | 3 |
| 11 | Mar 27 | at Oklahoma_City | W | 111-94 | 5 |
| 12 | Mar 26 | at Milwaukee | W | 122-114 | 3 |
| 13 | Mar 24 | at Milwaukee | L | 119-121 | 4 |
| 14 | Mar 19 | vs Sacramento | L | 96-107 | 3 |
| 15 | Mar 17 | at Cleveland | L | 110-117 | 5 |
| 16 | Mar 16 | vs Utah | L | 109-117 | 3 |
| 17 | Mar 14 | at Houston | W | 134-107 | 3 |
| 18 | Mar 4 | vs Toronto | W | 132-125 | 3 |
| 19 | Feb 26 | vs Indiana | W | 118-112 | 3 |
| 20 | Feb 21 | at New_Orleans | L | 115-120 | 6 |
| 21 | Feb 19 | vs Atlanta | W | 121-109 | 3 |
| 22 | Feb 16 | vs Denver | W | 112-99 | 3 |
| 23 | Feb 3 | at Sacramento | L | 111-116 | 3 |
| 24 | Jan 27 | at San_Antonio | L | 106-110 | 4 |
| 25 | Jan 22 | at Philadelphia | L | 110-122 | 3 |
| 26 | Jan 4 | at Toronto | W | 126-114 | 6 |
| 27 | Dec 30 | vs Memphis | W | 126-107 | 4 |
| 28 | Dec 23 | vs Milwaukee | W | 122-121 | 3 |
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