The 2020-21 roster for the Celtics included Kemba Walker at point guard, Marcus Smart at shooting guard, Jaylen Brown at small forward, Jayson Tatum at power forward and Tristan Thompson at center.

	NO.	NAME	POS	HEIGHT	WEIGHT	DOB	AGE	COLLEGE
1	7	Jaylen Brown J. Brown	SF	6'6"	223	10/24/1996	24	California
2	9	Moses Brown M. Brown	C	7'2"	245	10/13/1999	21	UCLA
3	4	Carsen Edwards C. Edwards	SG	5'11"	200	3/12/1998	22	Purdue
4	99	Tacko Fall T. Fall	C	7'5"	311	12/10/1995	25	Central Florida
5	94	Evan Fournier E. Fournier	SG	6'7"	205	10/29/1992	28
6	43	Javonte Green J. Green	SF	6'4"	205	7/23/1993	27	Radford
7	42	Al Horford A. Horford	C	6'9"	240	6/3/1986	34	Florida
8	40	Luke Kornet L. Kornet	PF	7'2"	250	7/15/1995	25	Vanderbilt
9	45	Romeo Langford R. Langford	SG	6'4"	216	10/25/1999	21	Indiana
10	26	Aaron Nesmith A. Nesmith	SG	6'6"	215	10/16/1999	21	Vanderbilt
11	37	Semi Ojeleye S. Ojeleye	PF	6'6"	240	12/5/1994	26	Southern Methodist
12	20	Jabari Parker J. Parker	PF	6'8"	245	3/15/1995	25	Duke
13	11	Payton Pritchard P. Pritchard	PG	6'2"	195	1/28/1998	23	Oregon
14	36	Marcus Smart M. Smart	SG	6'3"	220	3/6/1994	26	Oklahoma State
15	0	Jayson Tatum J. Tatum	PF	6'8"	210	3/3/1998	22	Duke
16	55	Jeff Teague J. Teague	PG	6'3"	195	6/10/1988	32	Wake Forest
17	27	Daniel Theis D. Theis	C	6'8"	245	4/4/1992	28
18	13	Tristan Thompson T. Thompson	C	6'9"	254	3/13/1991	29	Texas
19	21	Moritz Wagner M. Wagner	C	6'11"	245	4/26/1997	23	Michigan
20	8	Kemba Walker K. Walker	PG	6'0"	184	5/8/1990	30	Connecticut
21	51	Tremont Waters T. Waters	PG	5'10"	175	1/10/1998	23	Louisiana State
22	12	Grant Williams G. Williams	PF	6'6"	236	11/30/1998	22	Tennessee
23	44	Robert Williams III R. Williams III	C	6'8"	237	10/17/1997	23	Texas A&M