Greg Maddux has the most career starts with exactly 0 walks allowed, with 236 starts.

Interpreted as:

MLB most regular-season starts without a walk by a player

	NAME	GS	BB	G	W	L	W%	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	HBP	GF	IBB	TBF	WP	K/9	BB/9	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Greg Maddux G. Maddux	236	0	238	143	42	.773	2.54	1,087	40	19	0	1624.1	1,472	458	508	106	41	2	0	6,234	20	6.02	0.00	0.59	17.4	0.0	0.91	.273	2.81	8.16
2	Robin Roberts R. Roberts	168	0	215	85	65	.567	3.19	643	79	15	22	1273.2	1,259	451	509	146	15	36	0	5,014	6	4.54	0.00	1.03	12.8	0.0	0.99	.264	3.60	8.90
3	Grover Alexander G. Alexander	167	0	222	111	59	.653	2.35	535	122	34	24	1425.1	1,363	372	437	43	18	47		5,554	10	3.38	0.00	0.27	9.6	0.0	0.96	.266	2.76	8.61
4	Christy Mathewson C. Mathewson	161	0	219	119	56	.680	1.12	611	119	28	23	1417.2	1,232		426	39	10	52			13	3.88	0.00	0.25		0.0	0.87	.252	2.70	7.82
5	David Wells D. Wells	149	0	254	91	37	.711	3.20	750	27	7	10	1184.1	1,159	421	456	121	26	46	0	4,641	28	5.70	0.00	0.92	16.2	0.0	0.98	.277	3.47	8.81
6	Babe Adams B. Adams	147	0	228	77	62	.554	2.46	410	81	17	14	1241.0	1,235		459	30	21	57		4,857	11	2.97	0.00	0.22	8.4	0.0	1.00	.274	3.33	8.96
7	Jim Kaat J. Kaat	144	0	317	73	55	.570	3.01	609	50	9	13	1136.2	1,222	380	453	95	22	61	0	4,561	30	4.82	0.00	0.75	13.4	0.0	1.08	.294	3.59	9.68
8	Don Sutton D. Sutton	140	0	151	69	46	.600	3.00	654	31	12	5	974.1	919	325	366	95	13	8	0	3,823	21	6.04	0.00	0.88	17.1	0.0	0.94	.269	3.38	8.49
9	Zack Greinke Z. Greinke	139	0	166	70	34	.673	2.96	830	6	2	1	911.1	826	300	314	101	20	6	0	3,501	21	8.20	0.00	1.00	23.7	0.0	0.91	.284	3.10	8.16
10	Tommy John T. John	128	0	160	61	35	.635	2.99	438	33	11	2	881.1	906	293	334	68	14	15	0	3,490	22	4.47	0.00	0.69	12.6	0.0	1.03	.282	3.41	9.25
11	Walter Johnson W. Johnson	127	0	209	109	49	.690	1.43	791	102	27	23	1208.1	986		323	21	43	79			19	5.89	0.00	0.16		0.0	0.82	.261	2.41	7.34
12	Cy Young C. Young	126	0	146	94	34	.734	0.83	602	113	19	6	1147.1	959		301	17	22	17			11	4.72	0.00	0.13		0.0	0.84	.285	2.36	7.52
13	Lew Burdette L. Burdette	124	0	283	78	49	.614	3.57	381	52	11	22	1074.1	1,181	426	486	109	24	80	0	4,332	4	3.19	0.00	0.91	8.8	0.0	1.10	.281	4.07	9.89
14	Fergie Jenkins F. Jenkins	123	0	161	76	31	.710	3.03	735	59	13	4	964.1	891	325	354	100	15	22	0	3,746	6	6.86	0.00	0.93	19.6	0.0	0.92	.273	3.30	8.32
15	Mike Mussina M. Mussina	120	0	121	62	33	.653	3.53	647	15	7	0	794.2	779	312	330	90	10	0	0	3,105	10	7.33	0.00	1.02	20.8	0.0	0.98	.292	3.74	8.82
16	Brad Radke B. Radke	117	0	118	44	40	.524	4.33	458	15	4	0	761.0	845	366	388	107	18	0	0	3,081	7	5.42	0.00	1.27	14.9	0.0	1.11	.295	4.59	9.99
17	Eppa Rixey E. Rixey	117	0	190	67	50	.573	2.52	280	67	10	11	1000.0	1,040	280	371	21	11	56		3,968	16	2.52	0.00	0.19	7.1	0.0	1.04	.279	3.34	9.36
18	Paul Derringer P. Derringer	115	0	186	62	49	.559	2.88	369	66	12	22	968.0	1,051	310	390	46	7	55		3,917	8	3.43	0.00	0.43	9.4	0.0	1.09	.288	3.63	9.77
19	Bartolo Colon B. Colon	114	0	123	59	38	.608	3.63	479	9	5	0	743.0	786	300	316	90	4	2	0	2,955	4	5.80	0.00	1.09	16.2	0.0	1.06	.292	3.83	9.52
20	Bret Saberhagen B. Saberhagen	112	0	127	60	32	.652	2.77	519	26	6	1	795.0	724	245	264	66	14	10	0	3,045	13	5.88	0.00	0.75	17.0	0.0	0.91	.269	2.99	8.20
21	Jon Lieber J. Lieber	109	0	166	55	34	.618	3.89	558	14	2	2	807.2	886	349	386	103	11	13	0	3,277	11	6.22	0.00	1.15	17.0	0.0	1.10	.301	4.30	9.87
22	Dan Haren D. Haren	108	0	115	55	33	.625	3.44	590	8	3	1	714.0	719	273	298	103	23	3	0	2,831	24	7.44	0.00	1.30	20.8	0.0	1.01	.291	3.76	9.06
23	Juan Marichal J. Marichal	108	0	118	64	28	.696	2.49	522	57	13	2	815.1	742	226	259	76	10	7	0	3,155	12	5.76	0.00	0.84	16.5	0.0	0.91	.261	2.86	8.19
24	Bob Friend B. Friend	108	0	164	36	51	.414	3.66	383	28	7	7	773.0	882	314	350	67	6	37	0	3,135	5	4.46	0.00	0.78	12.2	0.0	1.14	.304	4.08	10.27
25	Gaylord Perry G. Perry	107	0	156	60	39	.606	3.09	551	48	16	7	848.0	819	291	329	78	19	22	0	3,324	19	5.85	0.00	0.83	16.6	0.0	0.97	.277	3.49	8.69