Lance McCullers Jr. gave up the most walks in 2021, with 76 allowed.

Interpreted as:

most walks with a minimum of 1 IP per team game for a pitcher 2021

	NAME	BB	SEASON	TM	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	Lance McCullers Jr. L. McCullers Jr.	76	2021	HOU	28	13	5	.722	28	3.16	185	0	0	0	162.1	122	57	59	13	10	0	0	684	7	10.26	4.21	2.43	0.72	27.0	11.1	1.22	.273	3.27	74	3.51	83	6.76	13
2	Luis Castillo L. Castillo	75	2021	CIN	33	8	16	.333	33	3.98	192	0	0	0	187.2	181	83	94	19	7	0	4	803	1	9.21	3.60	2.56	0.91	23.9	9.3	1.36	.318	4.51	90	3.74	84	8.68	14.5
3	Dylan Cease D. Cease	68	2021	CWS	32	13	7	.650	32	3.91	226	1	1	0	165.2	139	72	77	20	9	0	0	708	13	12.28	3.69	3.32	1.09	31.9	9.6	1.25	.309	4.18	90	3.40	76	7.55	18.9
4	Kyle Gibson K. Gibson	64	2021	TOT	31	10	9	.526	30	3.71	155	0	0	0	182.0	158	75	78	17	8	0	2	754	2	7.66	3.16	2.42	0.84	20.6	8.5	1.22	.276	3.86	86	3.86	88	7.81	10.3
5	Tyler Mahle T. Mahle	64	2021	CIN	33	13	6	.684	33	3.75	210	0	0	0	180.0	158	75	78	24	10	0	0	759	4	10.50	3.20	3.28	1.20	27.7	8.4	1.23	.297	3.90	85	3.80	85	7.90	12.9
6	Germán Márquez G. Márquez	64	2021	COL	32	12	11	.522	32	4.40	176	3	1	0	180.0	165	88	92	21	4	0	5	756	15	8.80	3.20	2.75	1.05	23.3	8.5	1.27	.293	4.60	91	3.86	87	8.25	11.7
7	Patrick Corbin P. Corbin	60	2021	WSH	31	9	16	.360	31	5.82	143	0	0	0	171.2	192	111	114	37	3	0	2	751	0	7.50	3.15	2.38	1.94	19.0	8.0	1.47	.305	5.98	139	5.40	126	10.07	-21
8	Dallas Keuchel D. Keuchel	59	2021	CWS	32	9	9	.500	30	5.28	95	0	0	0	162.0	189	95	105	25	7	0	1	720	5	5.28	3.28	1.61	1.39	13.2	8.2	1.53	.307	5.83	121	5.22	117	10.50	-13.1
9	Charlie Morton C. Morton	58	2021	ATL	33	14	6	.700	33	3.34	216	0	0	0	185.2	136	69	77	16	17	0	1	756	5	10.47	2.81	3.72	0.78	28.6	7.7	1.04	.267	3.73	79	3.17	75	6.59	21.4
10	Frankie Montas Jr. F. Montas Jr.	57	2021	OAK	32	13	9	.591	32	3.37	207	0	0	0	187.0	164	70	79	20	7	0	1	778	11	9.96	2.74	3.63	0.96	26.6	7.3	1.18	.296	3.80	82	3.37	81	7.89	16.5
11	Jordan Lyles J. Lyles	56	2021	TEX	32	10	13	.435	30	5.15	146	0	0	0	180.0	194	103	104	38	7	1	0	769	9	7.30	2.80	2.61	1.90	19.0	7.3	1.39	.299	5.20	117	5.33	121	9.70	-17.8
12	Joe Musgrove J. Musgrove	54	2021	SDP	32	11	9	.550	31	3.18	203	2	2	0	181.1	142	64	68	22	18	1	3	748	3	10.08	2.68	3.76	1.09	27.1	7.2	1.08	.266	3.38	81	3.69	88	7.05	10.2
13	Walker Buehler W. Buehler	52	2021	LAD	33	16	4	.800	33	2.47	212	0	0	0	207.2	149	57	61	19	6	0	2	815	5	9.19	2.25	4.08	0.82	26.0	6.4	0.97	.247	2.64	61	3.15	74	6.46	26
14	Lucas Giolito L. Giolito	52	2021	CWS	31	11	9	.550	31	3.53	201	1	0	0	178.2	145	70	74	27	2	0	1	720	12	10.13	2.62	3.87	1.36	27.9	7.2	1.10	.269	3.73	81	3.78	85	7.30	13
15	Robbie Ray R. Ray	52	2021	TOR	32	13	7	.650	32	2.84	248	0	0	0	193.1	150	61	62	33	4	0	0	773	5	11.54	2.42	4.77	1.54	32.1	6.7	1.04	.268	2.89	63	3.68	87	6.98	11.8
16	Sandy Alcantara S. Alcantara	50	2021	MIA	33	9	15	.375	33	3.19	201	1	0	0	205.2	171	73	85	21	10	0	2	837	6	8.80	2.19	4.02	0.92	24.0	6.0	1.07	.270	3.72	76	3.41	82	7.48	17.2
17	Kevin Gausman K. Gausman	50	2021	SFG	33	14	6	.700	33	2.81	227	0	0	0	192.0	150	60	66	20	4	0	1	775	7	10.64	2.34	4.54	0.94	29.3	6.5	1.04	.274	3.09	70	3.00	74	7.03	23.5
18	Wade Miley W. Miley	50	2021	CIN	28	12	7	.632	28	3.37	125	1	1	0	163.0	166	61	64	17	3	0	0	690	2	6.90	2.76	2.50	0.94	18.1	7.2	1.33	.301	3.53	76	3.96	89	9.17	8.8
19	Adam Wainwright A. Wainwright	50	2021	STL	32	17	7	.708	32	3.05	174	3	1	0	206.1	168	70	72	21	9	0	3	828	4	7.59	2.18	3.48	0.92	21.0	6.0	1.06	.256	3.14	75	3.66	88	7.33	11.5
20	Zack Wheeler Z. Wheeler	46	2021	PHI	32	14	10	.583	32	2.78	247	3	2	0	213.1	169	66	72	16	8	0	1	849	6	10.42	1.94	5.37	0.68	29.1	5.4	1.01	.288	3.04	66	2.58	60	7.13	40.7
21	José Berríos J. Berríos	45	2021	TOT	32	12	9	.571	32	3.52	204	1	0	0	192.0	159	75	83	22	15	0	0	781	3	9.56	2.11	4.53	1.03	26.1	5.8	1.06	.277	3.89	81	3.46	82	7.45	16.5
22	Yu Darvish Y. Darvish	44	2021	SDP	30	8	11	.421	30	4.22	199	0	0	0	166.1	138	78	81	28	8	0	1	681	9	10.77	2.38	4.52	1.52	29.2	6.5	1.09	.274	4.38	107	3.90	93	7.47	5.6
23	Kyle Hendricks K. Hendricks	44	2021	CHC	32	14	7	.667	32	4.77	131	1	0	0	181.0	200	96	101	31	13	0	3	785	2	6.51	2.19	2.98	1.54	16.7	5.6	1.35	.299	5.02	115	4.89	116	9.94	-14.1
24	Marcus Stroman M. Stroman	44	2021	NYM	33	10	13	.435	33	3.02	158	0	0	0	179.0	161	60	70	17	7	0	2	730	7	7.94	2.21	3.59	0.85	21.6	6.0	1.15	.286	3.52	76	3.49	83	8.09	14.2
25	Brandon Woodruff B. Woodruff	43	2021	MIL	30	9	10	.474	30	2.56	211	0	0	0	179.1	130	51	54	18	7	0	0	708	2	10.59	2.16	4.91	0.90	29.8	6.1	0.96	.261	2.71	61	2.95	69	6.52	26.4