Bobby Orr has the highest plus/minus by a defenseman in a season, at +124 in 1970-71.

	NAME	+/-	SEASON	TM	GP	G	A	P	PIM	PPG	PPA	SHG	SHA	GWG	OTG	S	S%
1	Bobby Orr B. Orr	+124	1970-71	BOS	78	37	102	139	91	5	44	3	10	5		392	9.4
2	Larry Robinson L. Robinson	+120	1976-77	MTL	77	19	66	85	45	3	15	0	0	3		196	9.7
3	Dallas Smith D. Smith	+98	1970-71	BOS	73	7	38	45	68	0	1	2	4	1		159	4.4
4	Mark Howe M. Howe	+87	1985-86	PHI	77	24	58	82	36	4	19	7	3	3	0	193	12.4
5	Brad McCrimmon B. McCrimmon	+86	1985-86	PHI	80	13	43	56	85	2	13	0	3	2	0	167	7.8
6	Bobby Orr B. Orr	+84	1973-74	BOS	74	32	90	122	82	11	24	0	4	4		384	8.3
7	Bobby Orr B. Orr	+83	1971-72	BOS	76	37	80	117	106	11	24	4	5	4		353	10.5
8	Bobby Orr B. Orr	+80	1974-75	BOS	80	46	89	135	101	16	36	2	2	4		384	12.0
9	Serge Savard S. Savard	+79	1976-77	MTL	78	9	33	42	35	0	5	0	0	1		118	7.6
10	Brian Engblom B. Engblom	+78	1981-82	MTL	76	4	29	33	76	1	7	0	2	0		109	3.7
11	Jacques Laperriere J. Laperriere	+77	1972-73	MTL	58	7	16	23	34	2	1	0	1	0		89	7.9
12	Serge Savard S. Savard	+72	1974-75	MTL	80	20	40	60	64	8	14	1	3	2		164	12.2
13	Denis Potvin D. Potvin	+71	1978-79	NYI	73	31	70	101	58	12	30	3	1	2		237	13.1
14	Larry Robinson L. Robinson	+71	1977-78	MTL	80	13	52	65	39	3	16	2	0	5		154	8.4
15	Guy Lapointe G. Lapointe	+70	1976-77	MTL	77	25	51	76	53	10	16	0	1	6		287	8.7
16	Serge Savard S. Savard	+70	1972-73	MTL	74	7	32	39	58	2	4	1	1	0		106	6.6
17	Brad Park B. Park	+69	1977-78	BOS	80	22	57	79	79	9	16	0	1	3		222	9.9
18	Rick Smith R. Smith	+68	1977-78	BOS	79	7	29	36	69	0	2	0	0	0		117	6.0
19	Rod Langway R. Langway	+66	1981-82	MTL	66	5	34	39	116	1	3	0	1	1		139	3.6
20	Jimmy Watson J. Watson	+66	1975-76	PHI	79	2	34	36	66	0	4	0	0	0		89	2.2
21	Guy Lapointe G. Lapointe	+64	1975-76	MTL	77	21	47	68	78	8	21	1	0	1		317	6.6
22	Brian Engblom B. Engblom	+63	1980-81	MTL	80	3	25	28	96	1	4	0	0	0		120	2.5
23	Al Sims A. Sims	+63	1973-74	BOS	77	3	9	12	22	0	0	0	0	1		111	2.7
24	Brad Park B. Park	+63	1971-72	NYR	75	24	49	73	130	8	16	2	1	4		263	9.1
25	Serge Savard S. Savard	+62	1977-78	MTL	77	8	34	42	24	4	11	0	2	1		102	7.8