Since 1950, Nolan Ryan has allowed the most walks, with 2,795 allowed.

Interpreted as:

most career walks given up with a minimum of 0.5 IP per team game by a player since 1950

	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	2,795	807	324	292	.526	773	3.19	5,714	222	61	3	5386.0	3,923	1,911	2,178	321	158	13	78	22,575	277	9.55	4.67	2.04	0.54	25.3	12.4	1.25	.265	3.64	90	2.96	83	6.56	370.2
2	Steve Carlton S. Carlton	1,833	741	329	244	.574	709	3.22	4,136	254	55	2	5217.2	4,672	1,864	2,130	414	53	13	150	21,683	183	7.13	3.16	2.26	0.71	19.1	8.5	1.25	.279	3.67	87	3.14	86	8.06	271.5
3	Phil Niekro P. Niekro	1,809	864	318	274	.537	716	3.35	3,342	245	45	29	5404.0	5,044	2,012	2,337	482	123	83	86	22,677	226	5.57	3.01	1.85	0.80	14.7	8.0	1.27	.270	3.89	87	3.61	95	8.40	116.1
4	Charlie Hough C. Hough	1,665	858	216	216	.500	440	3.75	2,362	107	13	61	3801.1	3,283	1,582	1,807	383	174	240	44	16,170	179	5.59	3.94	1.42	0.91	14.6	10.3	1.30	.250	4.28	95	4.28	109	7.77	-142.3
5	Roger Clemens R. Clemens	1,580	709	354	184	.658	707	3.12	4,672	118	46	0	4916.2	4,185	1,707	1,885	363	159	0	63	20,240	143	8.55	2.89	2.96	0.66	23.1	7.8	1.17	.284	3.45	70	3.08	71	7.66	680.4
6	Tom Glavine T. Glavine	1,500	682	305	203	.600	682	3.54	2,607	56	25	0	4413.1	4,298	1,734	1,900	356	66	0	145	18,604	65	5.32	3.06	1.74	0.73	14.0	8.1	1.31	.280	3.87	86	3.94	94	8.76	120.1
7	Randy Johnson R. Johnson	1,497	618	303	166	.646	603	3.29	4,875	100	37	2	4135.1	3,346	1,513	1,703	411	190	7	37	17,067	109	10.61	3.26	3.26	0.89	28.6	8.8	1.17	.291	3.71	75	3.18	73	7.28	554.3
8	Jack Morris J. Morris	1,390	549	254	186	.577	527	3.90	2,478	175	28	0	3824.0	3,567	1,657	1,815	389	58	10	99	16,120	206	5.83	3.27	1.78	0.92	15.4	8.6	1.30	.269	4.27	96	3.93	95	8.40	93
9	Tom Seaver T. Seaver	1,390	656	311	205	.603	647	2.86	3,640	231	61	1	4783.0	3,971	1,521	1,674	380	76	6	116	19,369	126	6.85	2.62	2.62	0.72	18.8	7.2	1.12	.259	3.15	79	3.03	85	7.47	286.1
10	Gaylord Perry G. Perry	1,379	777	314	265	.542	690	3.11	3,534	303	53	10	5350.0	4,938	1,846	2,128	399	108	33	164	21,953	160	5.95	2.32	2.56	0.67	16.1	6.3	1.18	.275	3.58	85	3.06	85	8.31	312.9
11	Bobby Witt B. Witt	1,375	430	142	157	.475	397	4.83	1,955	47	11	0	2465.0	2,493	1,324	1,449	252	39	13	37	11,003	128	7.14	5.02	1.42	0.92	17.8	12.5	1.57	.304	5.29	111	4.41	102	9.10	-26.2
12	Mike Torrez M. Torrez	1,371	494	185	160	.536	458	3.96	1,404	117	15	0	3043.2	3,043	1,340	1,501	223	59	13	84	13,179	103	4.15	4.05	1.02	0.66	10.7	10.4	1.45	.279	4.44	102	4.06	107	9.00	-86.3
13	Don Sutton D. Sutton	1,343	774	324	256	.559	756	3.26	3,574	178	58	5	5282.1	4,692	1,914	2,104	472	82	12	102	21,631	112	6.09	2.29	2.66	0.80	16.5	6.2	1.14	.261	3.58	92	3.23	90	7.99	181.2
14	Bob Gibson B. Gibson	1,336	528	251	174	.591	482	2.91	3,117	255	56	6	3884.1	3,279	1,258	1,420	257	102	21	118	16,068	108	7.22	3.10	2.33	0.60	19.4	8.3	1.19	.268	3.29	78	2.89	81	7.60	290.5
15	Chuck Finley C. Finley	1,332	524	200	173	.536	467	3.85	2,610	63	15	0	3197.1	3,069	1,366	1,517	304	76	24	36	13,638	130	7.35	3.75	1.96	0.86	19.1	9.8	1.38	.297	4.27	87	3.90	88	8.64	189.7
16	Bert Blyleven B. Blyleven	1,322	692	287	250	.534	685	3.31	3,701	242	60	0	4970.0	4,632	1,830	2,029	430	155	3	71	20,491	114	6.70	2.39	2.80	0.78	18.1	6.5	1.20	.282	3.67	85	3.18	82	8.39	368.6
17	Sam McDowell S. McDowell	1,312	425	141	134	.513	346	3.17	2,453	103	23	14	2492.1	1,948	879	999	164	59	39	74	10,587	140	8.86	4.74	1.87	0.59	23.2	12.4	1.31	.270	3.61	90	3.06	84	7.03	160.4
18	Jim Palmer J. Palmer	1,311	558	268	152	.638	521	2.86	2,212	211	53	4	3948.0	3,349	1,253	1,395	303	38	15	37	16,114	85	5.04	2.99	1.69	0.69	13.7	8.1	1.18	.249	3.18	80	3.50	95	7.63	83.2
19	Mark Langston M. Langston	1,289	457	179	158	.531	428	3.97	2,464	81	18	0	2962.2	2,723	1,306	1,438	311	46	3	34	12,562	89	7.49	3.92	1.91	0.94	19.6	10.3	1.35	.285	4.37	93	3.93	91	8.27	120.6
20	Joe Niekro J. Niekro	1,262	702	221	204	.520	500	3.59	1,747	107	29	16	3584.1	3,466	1,431	1,620	276	65	93	71	15,166	172	4.39	3.17	1.38	0.69	11.5	8.3	1.32	.270	4.07	102	3.79	107	8.70	-109.2
21	Tommy John T. John	1,259	760	288	231	.555	700	3.34	2,245	162	46	3	4710.1	4,783	1,749	2,017	302	98	22	102	19,692	187	4.29	2.41	1.78	0.58	11.4	6.4	1.28	.284	3.85	90	3.37	89	9.14	208.3
22	Early Wynn E. Wynn	1,258	474	217	150	.591	420	3.35	1,886	191	40	14	3132.2	2,746	1,166	1,298	266	48	44	36	13,170	33	5.42	3.61	1.50	0.76	14.3	9.6	1.28	.255	3.73	88	3.63	95	7.89	67.5
23	Frank Tanana F. Tanana	1,255	638	240	236	.504	616	3.66	2,773	143	34	1	4188.1	4,063	1,704	1,910	448	129	10	116	17,641	119	5.96	2.70	2.21	0.96	15.7	7.1	1.27	.277	4.10	94	3.78	96	8.73	66.4
24	Tim Wakefield T. Wakefield	1,205	627	200	180	.526	463	4.41	2,156	33	6	22	3226.1	3,152	1,582	1,791	418	186	78	33	13,939	134	6.01	3.36	1.79	1.17	15.5	8.6	1.35	.274	5.00	96	4.72	108	8.79	-137.5
25	Jerry Koosman J. Koosman	1,198	612	222	209	.515	527	3.36	2,556	140	33	17	3839.1	3,635	1,433	1,608	290	71	43	121	15,996	89	5.99	2.81	2.13	0.68	16.0	7.5	1.26	.282	3.77	92	3.25	90	8.52	152.5