Greg Maddux has intentionally walked the most career batters when winning 300+ games, with 177 walked.

Interpreted as:

pitcher with most IBB, 300 or more wins

	NAME	IBB	W	L	W%	G	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Greg Maddux G. Maddux	177	355	227	.610	744	740	3.16	3,371	109	35	0	5008.1	4,726	1,756	1,981	353	999	137	3	20,421	70	6.06	1.80	3.37	0.63	16.5	4.9	1.14	.281	3.56	76	3.25	78	8.49	519.5
2	Gaylord Perry G. Perry	164	314	265	.542	777	690	3.11	3,534	303	53	10	5350.0	4,938	1,846	2,128	399	1,379	108	33	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
3	Steve Carlton S. Carlton	150	329	244	.574	741	709	3.22	4,136	254	55	2	5217.2	4,672	1,864	2,130	414	1,833	53	13	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
4	Tom Glavine T. Glavine	145	305	203	.600	682	682	3.54	2,607	56	25	0	4413.1	4,298	1,734	1,900	356	1,500	66	0	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
5	Tom Seaver T. Seaver	116	311	205	.603	656	647	2.86	3,640	231	61	1	4783.0	3,971	1,521	1,674	380	1,390	76	6	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
6	Don Sutton D. Sutton	102	324	256	.559	774	756	3.26	3,574	178	58	5	5282.1	4,692	1,914	2,104	472	1,343	82	12	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
7	Phil Niekro P. Niekro	86	318	274	.537	864	716	3.35	3,342	245	45	29	5404.0	5,044	2,012	2,337	482	1,809	123	83	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
8	Nolan Ryan N. Ryan	78	324	292	.526	807	773	3.19	5,714	222	61	3	5386.0	3,923	1,911	2,178	321	2,795	158	13	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
9	Roger Clemens R. Clemens	63	354	184	.658	709	707	3.12	4,672	118	46	0	4916.2	4,185	1,707	1,885	363	1,580	159	0	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
10	Randy Johnson R. Johnson	37	303	166	.646	618	603	3.29	4,875	100	37	2	4135.1	3,346	1,513	1,703	411	1,497	190	7	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