Bert Blyleven has given up the most home runs in a season, with 50 HR in 1986.

Interpreted as:

most single season home runs allowed by a player

	NAME	HR	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Bert Blyleven B. Blyleven	50	1986	MIN	36	17	14	.548	36	4.01	215	16	3	0	271.2	262	121	134	58	10	0	4	1,126	4	7.12	1.92	3.71	1.66	19.1	5.2	1.18	.267	4.44	93	4.32	104	8.68	-5
2	Jose Lima J. Lima	48	2000	HOU	33	7	16	.304	33	6.65	124	0	0	0	196.1	251	145	152	68	2	0	3	895	3	5.68	3.12	1.82	2.20	13.9	7.6	1.62	.311	6.97	138	6.11	129	11.51	-29.2
3	Bronson Arroyo B. Arroyo	46	2011	CIN	32	9	12	.429	32	5.07	108	1	1	0	199.0	227	112	119	45	6	0	5	855	0	4.88	2.04	2.40	2.08	12.6	5.3	1.37	.278	5.38	132	5.71	144	10.27	-37.3
4	Bert Blyleven B. Blyleven	46	1987	MIN	37	15	12	.556	37	4.01	196	8	1	0	267.0	249	119	132	101	9	0	4	1,122	13	6.61	3.40	1.94	1.55	17.5	9.0	1.31	.264	4.45	87	4.87	109	8.39	-12.1
5	Robin Roberts R. Roberts	46	1956	PHI	43	19	18	.514	37	4.45	157	22	1	3	297.1	328	147	155	40	2	6	3	1,228	2	4.75	1.21	3.93	1.39	12.8	3.3	1.24	.287	4.69	119	3.75	97	9.93	3.8
6	Lance Lynn L. Lynn	44	2023	TOT	32	13	11	.542	32	5.73	191	0	0	0	183.2	189	117	127	67	9	0	1	808	3	9.36	3.28	2.85	2.16	23.6	8.3	1.39	.292	6.22	133	5.53	125	9.26	-21.7
7	Jamie Moyer J. Moyer	44	2004	SEA	34	7	13	.350	33	5.21	125	1	0	0	202.0	217	117	127	63	11	1	3	888	1	5.57	2.81	1.98	1.96	14.1	7.1	1.39	.268	5.66	117	5.73	129	9.67	-30.1
8	Eric Milton E. Milton	43	2004	PHI	34	14	6	.700	34	4.75	161	0	0	0	201.0	196	106	110	75	1	0	6	862	3	7.21	3.36	2.15	1.93	18.7	8.7	1.35	.263	4.93	108	5.35	118	8.78	-17.6
9	Pedro Ramos P. Ramos	43	1957	WSH	43	12	16	.429	30	4.79	91	7	1	0	231.0	251	123	131	69	7	5	4	1,011	2	3.55	2.69	1.32	1.68	9.0	6.8	1.39	.260	5.10	127	5.08	132	9.78	-31.6
10	Denny McLain D. McLain	42	1966	DET	38	20	14	.588	38	3.92	192	14	4	0	264.1	205	115	120	104	3	0	3	1,080	6	6.54	3.54	1.85	1.43	17.8	9.6	1.17	.221	4.09	113	4.38	122	6.98	-22.9
11	Lucas Giolito L. Giolito	41	2023	TOT	33	7	15	.318	33	4.88	204	0	0	0	184.1	169	100	110	73	9	0	2	794	5	9.96	3.56	2.79	2.00	25.7	9.2	1.31	.274	5.37	113	5.26	120	8.25	-17.8
12	Mike Leake M. Leake	41	2019	TOT	32	12	11	.522	32	4.29	127	2	1	0	197.0	227	94	114	27	10	0	2	835	2	5.80	1.23	4.70	1.87	15.2	3.2	1.29	.295	5.21	97	5.18	117	10.37	-16.9
13	Dylan Bundy D. Bundy	41	2018	BAL	31	8	16	.333	31	5.45	184	1	0	0	171.2	188	104	116	54	6	0	1	750	6	9.65	2.83	3.41	2.15	24.5	7.2	1.41	.316	6.08	128	5.16	117	9.86	-13.8
14	Rick Helling R. Helling	41	1999	TEX	35	13	11	.542	35	4.84	131	3	0	0	219.1	228	118	127	85	6	0	5	943	8	5.38	3.49	1.54	1.68	13.9	9.0	1.43	.275	5.21	97	5.60	115	9.36	-16.9
15	Phil Niekro P. Niekro	41	1979	ATL	44	21	20	.512	44	3.39	208	23	1	0	342.0	311	129	160	113	11	0	8	1,436	18	5.47	2.97	1.84	1.08	14.5	7.9	1.24	.254	4.21	84	4.15	101	8.18	0.1
16	Robin Roberts R. Roberts	41	1955	PHI	41	23	14	.622	38	3.28	160	26	1	3	305.0	292	111	137	53	2	3	3	1,256	3	4.72	1.56	3.02	1.21	12.7	4.2	1.13	.251	4.04	83	3.61	90	8.62	13.8
17	James Shields J. Shields	40	2016	TOT	33	6	19	.240	33	5.85	135	1	0	0	181.2	208	118	122	82	8	0	3	822	10	6.69	4.06	1.65	1.98	16.4	10.0	1.60	.302	6.04	142	6.00	143	10.30	-36.8
18	Eric Milton E. Milton	40	2005	CIN	34	8	15	.348	34	6.47	123	0	0	0	186.1	237	134	141	52	7	0	2	855	8	5.94	2.51	2.37	1.93	14.4	6.1	1.55	.311	6.81	152	5.43	124	11.45	-21
19	Ramon Ortiz R. Ortiz	40	2002	ANA	32	15	9	.625	32	3.77	162	4	1	0	217.1	188	91	97	68	5	0	0	896	7	6.71	2.82	2.38	1.66	18.1	7.6	1.18	.238	4.02	85	4.86	112	7.79	-12.1
20	Shawn Boskie S. Boskie	40	1996	CAL	37	12	11	.522	28	5.32	133	1	0	0	189.1	226	112	126	67	13	1	7	860	10	6.32	3.18	1.99	1.90	15.5	7.8	1.55	.306	5.99	107	5.77	116	10.74	-16.8
21	Brad Radke B. Radke	40	1996	MIN	35	11	16	.407	35	4.46	148	3	0	0	232.0	231	115	125	57	4	0	2	973	1	5.74	2.21	2.60	1.55	15.2	5.9	1.24	.264	4.85	89	4.92	100	8.96	-0.1
22	Bill Gullickson B. Gullickson	40	1987	TOT	35	14	13	.519	35	4.86	117	4	1	0	213.0	218	115	128	50	3	0	7	896	4	4.94	2.11	2.34	1.69	13.1	5.6	1.26	.259	5.41	114	4.95	117	9.21	-16.6
23	Jack Morris J. Morris	40	1986	DET	35	21	8	.724	35	3.27	223	15	6	0	267.0	229	97	105	82	0	0	7	1,092	12	7.52	2.76	2.72	1.35	20.4	7.5	1.16	.253	3.54	81	3.96	94	7.72	7.1
24	Fergie Jenkins F. Jenkins	40	1979	TEX	37	16	14	.533	37	4.07	164	10	3	0	259.0	252	117	127	81	3	0	6	1,089	4	5.70	2.81	2.02	1.39	15.1	7.4	1.29	.265	4.41	98	4.43	109	8.76	-11.6
25	Phil Niekro P. Niekro	40	1970	ATL	34	12	18	.400	32	4.27	168	10	3	0	229.2	222	109	124	68	6	1	2	980	6	6.58	2.66	2.47	1.57	17.1	6.9	1.26	.261	4.86	103	4.40	111	8.70	-10.7