David Hess has the most home runs allowed per inning pitched with 78.0+ innings pitched in a season, with 0.35 in 2019.

Interpreted as:

most hr/ip by a player in a season, minimum 78 ip

	NAME	HR/IP	IP	HR	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	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	David Hess D. Hess	0.35	80.0	28	2019	BAL	23	1	10	.091	14	7.09	68	0	0	0	94	63	73	30	2	5	0	365	1	7.65	3.38	2.27	3.15	18.6	8.2	1.55	.278	8.21	151	7.25	150	10.58	-20.1
2	Chris Young C. Young	0.32	88.2	28	2016	KCR	34	3	9	.250	13	6.19	94	0	0	1	104	61	63	43	1	7	1	406	3	9.54	4.36	2.19	2.84	23.2	10.6	1.66	.317	6.39	146	6.61	159	10.56	-24.8
3	Roddery Muñoz R. Muñoz	0.31	82.2	26	2024	MIA	18	2	7	.222	17	6.53	70	0	0	0	89	60	66	42	5	0	0	379	4	7.62	4.57	1.67	2.83	18.5	11.1	1.58	.267	7.19	155	7.26	179	9.69	-29.4
4	Ken Dixon K. Dixon	0.3	105.0	31	1987	BAL	34	7	10	.412	15	6.43	91	0	0	5	128	75	81	27	1	13	4	470	5	7.80	2.31	3.37	2.66	19.4	5.7	1.48	.303	6.94	146	5.76	128	10.97	-14.5
5	Jaime Barría J. Barría	0.29	82.2	24	2019	LAA	19	4	10	.286	13	6.42	75	0	0	0	92	59	61	27	2	1	0	365	1	8.17	2.94	2.78	2.61	20.5	7.4	1.44	.287	6.64	138	6.21	133	10.02	-14
6	Taijuan Walker T. Walker	0.29	83.2	24	2024	PHI	19	3	7	.300	15	7.10	58	0	0	0	107	66	68	37	3	1	0	381	0	6.24	3.98	1.57	2.58	15.2	9.7	1.72	.320	7.31	172	6.94	168	11.51	-25.4
7	José Suarez J. Suarez	0.28	81.0	23	2019	LAA	19	2	6	.250	15	7.11	72	0	0	0	100	64	67	33	10	0	1	375	5	8.00	3.67	2.18	2.56	19.2	8.8	1.64	.325	7.44	153	6.71	144	11.11	-18
8	Ezequiel Astacio E. Astacio	0.28	81.0	23	2005	HOU	22	3	6	.333	14	5.67	66	0	0	0	100	51	56	25	1	5	2	366	4	7.33	2.78	2.64	2.56	18.0	6.8	1.54	.307	6.22	134	6.03	141	11.11	-15.5
9	Bruce Chen B. Chen	0.28	98.2	28	2006	BAL	40	0	7	.000	12	6.93	70	0	0	0	137	76	81	35	0	16	3	453	1	6.39	3.19	2.00	2.55	15.5	7.7	1.74	.341	7.39	151	6.47	139	12.50	-19.3
10	Drew Smyly D. Smyly	0.28	114.0	32	2019	TOT	25	4	7	.364	21	6.24	120	0	0	1	126	79	83	55	2	1	0	514	7	9.47	4.34	2.18	2.53	23.3	10.7	1.59	.308	6.55	131	6.25	134	9.95	-19.4
11	Griffin Jax G. Jax	0.28	82.0	23	2021	MIN	18	4	5	.444	14	6.37	65	0	0	0	82	58	62	29	5	2	1	360	6	7.13	3.18	2.24	2.52	18.1	8.1	1.35	.248	6.80	149	6.47	153	9.00	-20.6
12	Andy Benes A. Benes	0.28	107.1	30	2001	STL	27	7	7	.500	19	7.38	78	0	0	0	122	88	92	61	6	3	0	500	1	6.54	5.11	1.28	2.52	15.6	12.2	1.70	.283	7.71	173	7.10	161	10.23	-32.2
13	Scott Klingenbeck S. Klingenbeck	0.28	79.2	22	1995	TOT	24	2	4	.333	9	7.12	42	0	0	0	101	63	65	42	4	4	0	373	7	4.74	4.74	1.00	2.49	11.3	11.3	1.79	.300	7.34	148	7.37	157	11.41	-23.6
14	Taylor Clarke T. Clarke	0.27	84.2	23	2019	ARI	23	5	5	.500	15	5.31	68	0	0	1	86	50	55	30	6	3	0	369	3	7.23	3.19	2.27	2.44	18.4	8.1	1.37	.260	5.85	120	6.40	148	9.14	-19.9
15	Greg Gohr G. Gohr	0.27	115.2	31	1996	TOT	32	5	9	.357	16	7.24	75	0	0	1	163	93	96	44	3	7	2	546	6	5.84	3.42	1.70	2.41	13.7	8.1	1.79	.336	7.47	144	6.57	130	12.68	-19
16	David Hernandez D. Hernandez	0.27	101.1	27	2009	BAL	20	4	10	.286	19	5.42	68	0	0	0	118	61	62	46	1	0	0	462	3	6.04	4.09	1.48	2.40	14.7	10.0	1.62	.284	5.51	119	6.60	144	10.48	-21.7
17	Josh Geer J. Geer	0.26	102.2	27	2009	SDP	19	1	7	.125	17	5.96	54	0	0	0	116	68	73	23	4	0	0	438	0	4.73	2.02	2.35	2.37	12.3	5.3	1.35	.270	6.40	156	6.24	154	10.17	-26.1
18	Gabriel Ynoa G. Ynoa	0.26	110.2	29	2019	BAL	36	1	10	.091	13	5.61	67	0	0	0	126	69	77	26	3	3	1	480	4	5.45	2.11	2.58	2.36	14.0	5.4	1.37	.273	6.26	119	6.18	128	10.25	-15.4
19	Chris Tillman C. Tillman	0.26	93.0	24	2017	BAL	24	1	7	.125	19	7.84	63	0	0	0	125	81	86	51	4	1	0	444	11	6.10	4.94	1.24	2.32	14.2	11.5	1.89	.334	8.32	176	6.92	152	12.10	-23.3
20	Luis Severino L. Severino	0.26	89.1	23	2023	NYY	19	4	8	.333	18	6.65	79	0	0	0	113	66	73	34	5	0	1	417	1	7.96	3.43	2.32	2.32	18.9	8.2	1.65	.326	7.35	155	6.14	139	11.38	-16.6
21	Carlos Perez C. Perez	0.26	89.2	23	1999	LAD	17	2	10	.167	16	7.43	40	0	0	0	116	74	77	39	6	0	1	420	2	4.01	3.91	1.03	2.31	9.5	9.3	1.73	.298	7.73	175	7.07	155	11.64	-25.2
22	Scott Elarton S. Elarton	0.26	132.2	34	2001	TOT	24	4	10	.286	24	7.06	87	0	0	0	146	104	105	59	6	0	2	595	5	5.90	4.00	1.47	2.31	14.6	9.9	1.55	.274	7.12	152	6.53	145	9.90	-28.7
23	Josiah Gray J. Gray	0.26	148.2	38	2022	WSH	28	7	10	.412	28	5.02	154	0	0	0	136	83	84	66	8	0	1	649	7	9.32	4.00	2.33	2.30	23.7	10.2	1.36	.256	5.09	124	5.85	145	8.23	-29.8
24	Jorge Sosa J. Sosa	0.25	118.0	30	2006	TOT	45	3	11	.214	13	5.42	75	0	0	4	138	71	79	40	1	12	6	524	2	5.72	3.05	1.88	2.29	14.3	7.6	1.51	.286	6.03	122	6.22	139	10.53	-23.3
25	Dennis Springer D. Springer	0.25	94.2	24	1996	CAL	20	5	6	.455	15	5.51	64	2	1	0	91	58	65	43	6	3	0	413	1	6.08	4.09	1.49	2.28	15.5	10.4	1.42	.243	6.18	110	6.66	134	8.65	-17.6