Bob Turley has walked the highest career walks per nine innings, with 5.61 BB/9.

Interpreted as:

highest bb/9 with a minimum of 1500 IP by a player in career

	NAME	BB/9	IP	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Bob Turley B. Turley	5.61	1712.2	310	101	85	.543	237	3.64	1,265	78	24	13	1,366	693	753	140	1,068	56	38	21	7,447	39	6.65	1.18	0.74	17.0	14.3	1.42	.249	3.96	98	4.02	108	7.18	-66.7
2	Ed Crane E. Crane	5.14	1551.0	204	72	97	.426	176	3.99	719	146	7	2	1,525	687	1,188	50	885	58	26		7,110	146	4.17	0.81	0.29	10.1	12.4	1.55	.273	6.89	108	4.05	109	8.85	-55.7
3	Bobby Witt B. Witt	5.02	2465.0	430	142	157	.475	397	4.83	1,955	47	11	0	2,493	1,324	1,449	252	1,375	39	13	37	11,003	128	7.14	1.42	0.92	17.8	12.5	1.57	.304	5.29	111	4.41	102	9.10	-26.2
4	Johnny Vander Meer J. Vander Meer	4.84	2104.2	346	119	121	.496	286	3.44	1,294	131	29	2	1,799	805	915	100	1,132	21	28		9,034	37	5.53	1.14	0.43	14.3	12.5	1.39	.262	3.91	94	3.64	98	7.69	11.3
5	Walt Masterson W. Masterson	4.83	1649.2	399	78	100	.438	184	4.15	815	70	15	21	1,613	760	888	101	886	28	115	1	7,281	33	4.45	0.92	0.55	11.2	12.2	1.51	.277	4.84	105	4.03	103	8.80	-21.7
6	Sam McDowell S. McDowell	4.74	2492.1	425	141	134	.513	346	3.17	2,453	103	23	14	1,948	879	999	164	1,312	59	39	74	10,587	140	8.86	1.87	0.59	23.2	12.4	1.31	.270	3.61	90	3.06	84	7.03	160.4
7	Blue Moon Odom B. Moon Odom	4.70	1509.0	295	84	85	.497	229	3.70	857	40	15	1	1,362	620	708	103	788	36	21	40	6,528	92	5.11	1.09	0.61	13.1	12.1	1.42	.265	4.22	110	3.89	113	8.12	-80.4
8	Nolan Ryan N. Ryan	4.67	5386.0	807	324	292	.526	773	3.19	5,714	222	61	3	3,923	1,911	2,178	321	2,795	158	13	78	22,575	277	9.55	2.04	0.54	25.3	12.4	1.25	.265	3.64	90	2.96	83	6.56	370.2
9	Vern Kennedy V. Kennedy	4.66	2025.2	344	104	132	.441	263	4.67	691	127	7	6	2,173	1,052	1,202	130	1,049	24	56		9,055	54	3.07	0.66	0.58	7.6	11.6	1.59	.285	5.34	107	4.60	108	9.65	-72.9
10	Russ Ortiz R. Ortiz	4.66	1661.1	311	113	89	.559	266	4.51	1,192	9	3	0	1,618	832	903	179	860	45	13	37	7,316	57	6.46	1.39	0.97	16.3	11.8	1.49	.286	4.89	105	4.66	108	8.77	-63.9
11	Shawn Estes S. Estes	4.60	1678.1	283	101	93	.521	281	4.71	1,210	14	8	0	1,708	879	950	158	858	57	0	36	7,403	79	6.49	1.41	0.85	16.3	11.6	1.53	.303	5.09	110	4.49	103	9.16	-23.6
12	Allie Reynolds A. Reynolds	4.55	2492.1	434	182	107	.630	309	3.30	1,423	137	36	48	2,193	915	1,026	133	1,261	57	97		10,660	59	5.14	1.13	0.48	13.3	11.8	1.39	.265	3.70	90	3.64	99	7.92	2.9
13	Kirby Higbe K. Higbe	4.51	1952.1	418	118	101	.539	238	3.69	971	98	11	24	1,763	800	909	116	979	35	104		8,472	61	4.48	0.99	0.53	11.5	11.6	1.40	.259	4.19	98	3.95	103	8.13	-22.6
14	Sam Jones S. Jones	4.50	1643.1	322	102	101	.502	222	3.59	1,376	76	17	10	1,403	655	752	151	822	60	45	37	7,074	45	7.54	1.67	0.83	19.5	11.6	1.35	.268	4.12	92	3.61	93	7.68	49.1
15	Johnny Klippstein J. Klippstein	4.47	1967.2	711	101	118	.461	161	4.24	1,158	37	6	65	1,915	927	1,059	203	978	70	275	70	8,656	97	5.30	1.18	0.93	13.4	11.3	1.47	.274	4.84	106	4.24	106	8.76	-52.7
16	Bump Hadley B. Hadley	4.41	2945.2	528	161	165	.494	355	4.24	1,318	134	14	25	2,980	1,389	1,609	167	1,442	63	108		13,016	72	4.03	0.91	0.51	10.1	11.1	1.50	.281	4.92	96	4.42	102	9.10	-27.9
17	Al Leiter A. Leiter	4.38	2391.0	419	162	132	.551	382	3.80	1,974	16	10	2	2,152	1,010	1,101	198	1,163	117	9	53	10,334	63	7.43	1.70	0.75	19.1	11.3	1.39	.284	4.14	90	4.09	95	8.10	63
18	Jamey Wright J. Wright	4.32	2036.2	719	97	130	.427	248	4.81	1,189	6	3	2	2,168	1,088	1,208	200	978	155	133	73	9,038	87	5.25	1.22	0.88	13.2	10.8	1.54	.302	5.34	105	4.86	109	9.58	-84.5
19	J.R. Richard	4.32	1606.0	238	107	71	.601	221	3.15	1,493	76	19	0	1,227	562	625	73	770	17	3	15	6,674	92	8.37	1.94	0.41	22.4	11.5	1.24	.267	3.50	92	2.85	82	6.88	114.7
20	Edinson Volquez E. Volquez	4.28	1546.1	294	95	89	.516	273	4.45	1,323	4	2	0	1,507	765	829	159	735	76	5	27	6,797	77	7.70	1.80	0.93	19.5	10.8	1.45	.299	4.82	112	4.31	107	8.77	-50.2
21	Steve Barber S. Barber	4.28	1999.0	466	121	106	.533	272	3.36	1,309	59	21	14	1,818	747	870	125	950	42	90	59	8,591	91	5.89	1.38	0.56	15.2	11.1	1.38	.275	3.92	96	3.52	99	8.19	10.6
22	Herm Wehmeier H. Wehmeier	4.25	1803.0	361	92	108	.460	240	4.80	794	79	9	9	1,806	961	1,044	210	852	31	48	22	7,925	48	3.96	0.93	1.05	10.0	10.8	1.47	.264	5.21	120	4.58	113	9.01	-107
23	Don Larsen D. Larsen	4.22	1548.0	412	81	91	.471	171	3.78	849	44	11	23	1,442	650	728	130	725	26	132	35	6,708	39	4.94	1.17	0.76	12.7	10.8	1.40	.264	4.23	101	3.94	106	8.38	-39.9
24	Mark Baldwin M. Baldwin	4.20	2802.1	346	154	165	.483	328	3.37	1,349	295	14	5	2,695	1,050	1,816	81	1,307	123	19		12,470	221	4.33	1.03	0.26	10.8	10.5	1.43	.272	5.83	91	3.79	100	8.66	-0.9
25	Tom Gordon T. Gordon	4.17	2108.0	890	138	126	.523	203	3.96	1,928	18	4	158	1,889	927	1,016	176	977	38	347	57	9,058	112	8.23	1.97	0.75	21.3	10.8	1.36	.288	4.34	89	3.70	86	8.06	144.4