The Toronto Maple Leafs lost their most games in a season in 1984-85, with 52 losses.

	TEAM	L	SEASON	GP	W	T	OTL	PTS	PTS%	SOW	SOL	G	GA	DIFF	PP%	PK%	S/GP	S%	SA/GP	SV%
1	Maple Leafs	52	1984-85	80	20	8		48	.300			253	358	-105	19.8	73.9	29.08	10.9	32.88	.864
2	Maple Leafs	49	1987-88	80	21	10		52	.325			273	345	-72	15.6	77.9	30.14	11.3	33.99	.873
3	Maple Leafs	48	1985-86	80	25	7		57	.356			311	386	-75	18.3	77.3	31.33	12.4	34.66	.861
4	Maple Leafs	46	1990-91	80	23	11		57	.356			241	318	-77	17.6	77.4	29.29	10.3	32.16	.876
5	Maple Leafs	46	1988-89	80	28	6		62	.388			259	342	-83	16.7	72.7	27.06	12.0	34.29	.875
6	Maple Leafs	45	1983-84	80	26	9		61	.381			303	387	-84	21.7	73.6	29.36	12.9	35.40	.863
7	Maple Leafs	44	2014-15	82	30		8	68	.415	5	5	206	257	-51	15.9	80.5	29.23	8.6	33.51	.906
8	Maple Leafs	44	1996-97	82	30	8		68	.415			230	273	-43	15.5	82.0	29.28	9.6	34.43	.903
9	Maple Leafs	44	1981-82	80	20	16		56	.350			298	380	-82	20.3	73.0	29.10	12.8	34.71	.863
10	Maple Leafs	43	1997-98	82	30	9		69	.421			194	237	-43	11.4	86.6	27.71	8.5	28.68	.899
11	Maple Leafs	43	1991-92	80	30	7		67	.419			234	294	-60	17.5	80.9	30.31	9.6	31.13	.882
12	Maple Leafs	42	2015-16	82	29		11	69	.421	6	6	192	240	-48	15.4	81.6	30.67	7.6	30.52	.904
13	Maple Leafs	42	1986-87	80	32	6		70	.438			286	319	-33	17.2	78.0	30.13	11.9	32.44	.877
14	Maple Leafs	41	1972-73	78	27	10		64	.410			247	279	-32			33.10	9.6	33.03	.892
15	Maple Leafs	40	1982-83	80	28	12		68	.425			293	330	-37	22.5	75.0	28.39	12.9	31.81	.870
16	Maple Leafs	40	1979-80	80	35	5		75	.469			304	327	-23	24.7	79.1	32.42	11.7	33.28	.877
17	Maple Leafs	38	2009-10	82	30		14	74	.451	4	4	210	263	-53	14.0	74.7	32.57	7.9	29.76	.892
18	Maple Leafs	38	1989-90	80	38	4		80	.500			337	358	-21	23.3	78.2	30.44	13.8	34.98	.872
19	Maple Leafs	38	1957-58	70	21	11		53	.379			192	226	-34			30.39	9.0	30.17	.893
20	Maple Leafs	37	2011-12	82	35		10	80	.488	4	5	227	259	-32	18.4	77.3	28.32	9.8	30.83	.898
21	Maple Leafs	37	1980-81	80	28	15		71	.444			322	367	-45	25.3	77.4	34.31	11.7	33.55	.863
22	Maple Leafs	36	2013-14	82	38		8	84	.512	9	4	222	252	-30	19.8	78.4	27.93	9.7	35.91	.914
23	Maple Leafs	36	1995-96	82	34	12		80	.488			247	252	-5	18.9	82.6	32.62	9.2	31.84	.903
24	Maple Leafs	35	2008-09	82	34		13	81	.494	6	7	244	286	-42	18.8	74.7	31.74	9.4	30.26	.885
25	Maple Leafs	35	2007-08	82	36		11	83	.506	3	4	228	256	-28	17.8	78.1	31.00	9.0	29.30	.893