Between the 1970 and 1979 seasons, Nolan Ryan allowed the most walks, with 1,515 allowed.

Interpreted as:

most walks with a minimum of 0.5 IP per team game as a pitcher in the 1970s

	NAME	BB	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	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	Nolan Ryan N. Ryan	1,515	348	155	146	.515	333	3.14	2,678	164	42	2	2465.0	1,731	860	984	133	75	8	34	10,453	116	9.78	5.53	1.77	0.49	25.6	14.5	1.32	.264	3.59	89	3.05	85	6.32	150.5
2	Mike Torrez M. Torrez	962	323	134	104	.563	313	3.71	985	100	14	0	2138.2	2,049	882	1,001	148	44	3	58	9,194	74	4.15	4.05	1.02	0.62	10.7	10.5	1.41	.269	4.21	96	3.99	105	8.62	-43.1
3	Steve Carlton S. Carlton	960	368	178	126	.586	366	3.18	2,097	165	32	0	2747.0	2,413	971	1,103	238	31	0	87	11,361	81	6.87	3.15	2.18	0.78	18.5	8.4	1.23	.271	3.61	85	3.26	89	7.91	125.5
4	Phil Niekro P. Niekro	920	406	164	151	.521	376	3.26	1,866	160	25	8	2881.0	2,642	1,045	1,228	259	76	19	53	12,043	116	5.83	2.87	2.03	0.81	15.5	7.6	1.24	.267	3.84	83	3.50	90	8.25	120.6
5	Jim Palmer J. Palmer	861	355	186	103	.644	352	2.58	1,559	175	44	2	2745.0	2,275	787	883	184	26	3	31	11,105	55	5.11	2.82	1.81	0.60	14.0	7.8	1.14	.247	2.90	73	3.28	90	7.46	110.6
6	Joe Coleman J. Coleman	795	380	107	97	.525	246	3.76	1,319	64	12	6	1937.2	1,813	810	919	183	63	68	51	8,277	89	6.13	3.69	1.66	0.85	15.9	9.6	1.35	.275	4.27	102	3.74	100	8.42	-0.8
7	Vida Blue V. Blue	780	330	155	109	.587	327	3.07	1,600	124	32	1	2398.2	2,080	819	927	161	19	1	42	9,827	69	6.00	2.93	2.05	0.60	16.3	7.9	1.19	.264	3.48	88	3.12	87	7.80	125.1
8	Steve Renko S. Renko	775	323	94	109	.463	272	3.95	1,112	47	9	4	1846.0	1,764	810	912	184	17	20	74	7,926	60	5.42	3.78	1.43	0.90	14.0	9.8	1.38	.271	4.45	103	3.96	106	8.60	-37
9	Gaylord Perry G. Perry	758	369	184	133	.580	368	2.92	1,907	197	36	1	2905.0	2,559	942	1,088	207	51	1	75	11,759	68	5.91	2.35	2.52	0.64	16.2	6.4	1.14	.266	3.37	80	3.02	83	7.93	199.6
10	Jerry Koosman J. Koosman	747	337	124	127	.494	313	3.30	1,587	85	15	5	2281.1	2,119	837	947	173	40	13	74	9,498	53	6.26	2.95	2.12	0.68	16.7	7.9	1.26	.280	3.74	92	3.22	89	8.36	97.6
11	Fred Norman F. Norman	744	340	100	94	.515	253	3.54	1,208	54	15	4	1794.2	1,642	705	777	170	19	28	69	7,636	80	6.06	3.73	1.62	0.85	15.8	9.7	1.33	.268	3.90	99	3.74	105	8.23	-39.1
12	Jerry Reuss J. Reuss	742	323	114	108	.514	287	3.79	1,141	83	22	6	1967.0	2,000	828	942	121	34	18	66	8,486	73	5.22	3.40	1.54	0.55	13.4	8.7	1.39	.291	4.31	105	3.40	95	9.15	41.9
13	Tom Seaver T. Seaver	741	348	178	101	.638	345	2.61	2,304	147	40	0	2652.1	2,105	768	843	190	28	2	65	10,607	64	7.82	2.51	3.11	0.64	21.7	7.0	1.07	.261	2.86	73	2.64	74	7.14	272
14	J.R. Richard	730	221	97	67	.591	204	3.24	1,374	72	15	0	1492.1	1,162	538	594	71	17	3	14	6,236	90	8.29	4.40	1.88	0.43	22.0	11.7	1.27	.270	3.58	95	2.92	84	7.01	94.8
15	Bert Blyleven B. Blyleven	711	353	148	128	.536	350	2.88	2,082	145	39	0	2624.2	2,335	841	949	186	70	2	43	10,722	61	7.14	2.44	2.93	0.64	19.4	6.6	1.16	.280	3.25	78	2.80	76	8.01	260.7
16	Rudy May R. May	708	338	110	107	.507	271	3.46	1,238	74	22	3	1870.1	1,649	720	825	143	31	23	42	7,807	36	5.96	3.41	1.75	0.69	15.9	9.1	1.26	.265	3.97	100	3.43	97	7.93	20.1
17	Andy Messersmith A. Messersmith	696	276	110	86	.561	257	2.93	1,340	86	24	9	1899.0	1,506	619	710	154	34	16	33	7,791	51	6.35	3.30	1.93	0.73	17.2	8.9	1.16	.243	3.36	84	3.36	94	7.14	43.9
18	Jim Slaton J. Slaton	693	287	104	112	.481	271	3.87	873	80	21	0	1895.1	1,923	814	913	180	35	5	45	8,119	70	4.15	3.29	1.26	0.85	10.8	8.5	1.38	.275	4.34	103	4.07	108	9.13	-65.1
19	Stan Bahnsen S. Bahnsen	691	396	110	112	.495	254	3.80	961	57	13	13	1854.2	1,841	784	869	164	31	59	38	7,896	65	4.66	3.35	1.39	0.80	12.2	8.8	1.37	.277	4.22	107	3.84	106	8.93	-47.5
20	Jack Billingham J. Billingham	673	359	135	103	.567	296	3.77	1,017	73	27	5	2045.2	2,070	857	970	157	87	32	76	8,670	75	4.47	2.96	1.51	0.69	11.7	7.8	1.34	.284	4.27	103	3.69	101	9.11	-12.3
21	Don Sutton D. Sutton	660	352	166	110	.601	349	3.07	1,767	117	39	2	2557.1	2,174	871	975	214	45	3	45	10,403	63	6.22	2.32	2.68	0.75	17.0	6.3	1.11	.254	3.43	87	3.11	88	7.65	121.3
22	Bill Bonham B. Bonham	631	296	73	82	.471	210	4.00	972	27	4	11	1468.1	1,491	652	733	97	35	33	57	6,403	68	5.96	3.87	1.54	0.59	15.2	9.9	1.45	.299	4.49	103	3.50	92	9.14	54.3
23	Ken Holtzman K. Holtzman	626	329	126	107	.541	294	3.50	1,038	97	22	2	2073.2	2,066	807	928	175	32	15	42	8,728	72	4.51	2.72	1.66	0.76	11.9	7.2	1.30	.276	4.03	96	3.61	98	8.97	17.2
24	Jim Rooker J. Rooker	617	285	97	91	.516	229	3.43	856	58	14	7	1629.1	1,538	621	725	115	17	21	52	6,896	50	4.73	3.41	1.39	0.64	12.4	8.9	1.32	.269	4.00	95	3.64	99	8.50	5.9
25	Clay Kirby C. Kirby	613	226	68	84	.447	204	3.84	948	40	8	0	1332.1	1,226	569	647	138	24	8	44	5,751	76	6.40	4.14	1.55	0.93	16.5	10.7	1.38	.270	4.37	109	3.88	112	8.28	-68.1