The 2023-24 defensemen for the Bruins included Frederic Brunet, Michael Callahan, Brandon Carlo, Jackson Edward and Derek Forbort.

	NO.	NAME	POS	HEIGHT	WEIGHT	DOB	AGE	BIRTHPLACE
1		Frederic Brunet F. Brunet	D	6'2"	185	8/21/2003	20	Gatineau, Canada
2	79	Michael Callahan M. Callahan	D	6'2"	197	9/23/1999	24	Franklin, MA
3	25	Brandon Carlo B. Carlo	D	6'6"	218	11/26/1996	27	Colorado Springs, CO
4		Jackson Edward J. Edward	D	6'3"	188	2/27/2004	19	Newmarket, Canada
5	28	Derek Forbort D. Forbort	D	6'4"	208	3/4/1992	31	Duluth, MN
6	27	Ryan Graves R. Graves	D	6'5"	220	5/21/1995	28	Yarmouth, Canada
7	48	Matt Grzelcyk M. Grzelcyk	D	5'10"	176	1/5/1994	30	Charlestown, MA
8		Kristian Kostadinski K. Kostadinski	D	6'5"	213	5/20/2005	18	Gothenburg, Sweden
9	27	Hampus Lindholm H. Lindholm	D	6'4"	215	1/20/1994	30	Helsingborg, Sweden
10	6	Mason Lohrei M. Lohrei	D	6'5"	211	1/17/2001	23	Baton Rouge, LA
11	87	Ryan Mast R. Mast	D	6'4"	190	1/14/2003	21	Bloomfield Hills, MI
12	73	Charlie McAvoy C. McAvoy	D	6'1"	209	12/21/1997	26	Long Beach, NY
13	14	Ian Mitchell I. Mitchell	D	5'11"	193	1/18/1999	25	St. Albert, Canada
14	52	Andrew Peeke A. Peeke	D	6'3"	210	3/17/1998	25	Parkland, FL
15	75	Alec Regula A. Regula	D	6'4"	208	8/6/2000	23	West Bloomfield, MI
16	44	Dan Renouf D. Renouf	D	6'1"	198	6/1/1994	29	Pickering, Canada
17		Ethan Ritchie E. Ritchie	D	6'0"	195	6/4/2002	21	Brampton, Canada
18	12	Kevin Shattenkirk K. Shattenkirk	D	6'0"	212	1/29/1989	35	New Rochelle, NY
19	92	Reilly Walsh R. Walsh	D	6'0"	185	4/21/1999	24	Framingham, MA
20	29	Parker Wotherspoon P. Wotherspoon	D	6'1"	195	8/24/1997	26	Surrey, Canada
21	67	Jakub Zboril J. Zboril	D	6'1"	201	2/21/1997	26	Brno, Czech Republic