The 2021 roster for the Red Sox included Nathan Eovaldi at pitcher, Christian Vázquez at catcher, Bobby Dalbec at first baseman, Marwin Gonzalez at second baseman and Rafael Devers at third baseman.

	NO.	NAME	POS	HEIGHT	WEIGHT	DOB	AGE	BIRTHPLACE
1	35	Matt Andriese M. Andriese	P	6'2"	225	8/28/1989	31	Redlands, CA
2	3	Jonathan Araúz J. Araúz	2B	6'0"	150	8/3/1998	22	Alanje, Panama
3	39	Christian Arroyo C. Arroyo	2B	6'1"	220	5/30/1995	26	Tampa, FL
4	32	Matt Barnes M. Barnes	P	6'4"	210	6/17/1990	31	Danbury, CT
5	83	Eduard Bazardo E. Bazardo	P	6'0"	155	9/1/1995	25	Maracay, Venezuela
6	2	Xander Bogaerts X. Bogaerts	SS	6'1"	210	10/1/1992	28	Oranjestad, Aruba
7	70	Ryan Brasier R. Brasier	P	6'0"	225	8/26/1987	33	Wichita Falls, TX
8	66	Brandon Brennan B. Brennan	P	6'4"	220	7/26/1991	29	Mission Viejo, CA
9	48	Colten Brewer C. Brewer	P	6'4"	230	10/29/1992	28	Dallas, TX
10	31	Austin Brice A. Brice	P	6'4"	235	6/19/1992	29	Hong Kong, China
11	23	Michael Chavis M. Chavis	2B	5'10"	216	8/11/1995	25	Marietta, GA
12	16	Franchy Cordero F. Cordero	1B	6'3"	175	9/2/1994	26	Azua, Dominican Republic
13	79	Kutter Crawford K. Crawford	P	6'1"	192	4/1/1996	25	Okeechobee, FL
14	29	Bobby Dalbec B. Dalbec	1B	6'4"	225	6/29/1995	26	Seattle, WA
15	65	Austin Davis A. Davis	P	6'4"	245	2/3/1993	28	Scottsdale, AZ
16	11	Rafael Devers R. Devers	3B	6'0"	237	10/24/1996	24	Sanchez, Dominican Republic
17	40	Jarren Duran J. Duran	CF	6'2"	200	9/5/1996	24	Corona, CA
18	17	Nathan Eovaldi N. Eovaldi	P	6'2"	225	2/13/1990	31	Houston, TX
19	80	Raynel Espinal R. Espinal	P	6'3"	215	10/6/1991	29	Villa Gonzalez, Dominican Republic
20	48	Michael Feliz M. Feliz	P	6'4"	240	6/28/1993	28	Azua, Dominican Republic
21	78	Stephen Gonsalves S. Gonsalves	P	6'5"	220	7/8/1994	26	San Diego, CA
22	12	Marwin Gonzalez M. Gonzalez	2B	6'1"	205	3/14/1989	32	Puerto Ordaz, Venezuela
23	77	Jay Groome J. Groome	P	6'6"	220	8/23/1998	22	Barnegat, NJ
24	63	Darwinzon Hernandez D. Hernandez	P	6'2"	245	12/17/1996	24	Ciudad Bolivar, Venezuela
25	59	Ronaldo Hernandez R. Hernandez	C	6'1"	185	11/11/1997	23	Arjona, Colombia