Barry Bonds has the most career intentional walks in the postseason, with 21 intentional walks.

Interpreted as:

most intentional walks by a player in playoffs

	NAME	IBB	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	GIDP	AVG	OBP	SLG	OPS
1	Barry Bonds B. Bonds	21	48	151	33	37	8	2	9	24	52	1	26	9	1	208	76	19	0	4	1	.245	.433	.503	.936
2	Albert Pujols A. Pujols	20	88	304	57	97	18	1	19	54	50	5	46	1	2	360	174	38	0	1	7	.319	.422	.572	.995
3	Manny Ramirez M. Ramirez	12	111	410	67	117	19	0	29	78	72	5	91	1	1	493	223	48	0	6	17	.285	.394	.544	.937
4	David Ortiz D. Ortiz	11	85	304	51	88	22	2	17	61	59	2	72	0	1	369	165	41	0	4	4	.289	.404	.543	.947
5	Chipper Jones C. Jones	11	93	338	58	97	18	0	13	47	72	1	61	8	3	417	154	31	1	5	10	.287	.409	.456	.864
6	Bernie Williams B. Williams	11	121	465	83	128	29	0	22	80	71	3	85	8	5	545	223	51	0	6	17	.275	.371	.480	.850
7	Shohei Ohtani S. Ohtani	9	32	124	27	30	4	1	11	24	28	1	45	1	3	153	69	16	0	0	0	.242	.386	.556	.942
8	Jorge Posada J. Posada	9	125	416	53	103	23	1	11	42	70	3	109	3	3	492	161	35	0	3	15	.248	.358	.387	.745
9	Mookie Betts M. Betts	8	90	360	57	92	26	1	8	42	48	2	63	16	1	415	144	35	0	5	6	.256	.342	.400	.742
10	Keith Hernandez K. Hernandez	8	30	117	13	31	3	1	2	21	20	0	19	1	0	138	42	6	0	1	3	.265	.370	.359	.729
11	José Ramírez J. Ramírez	7	45	167	17	40	10	0	4	19	20	1	33	2	2	190	62	14	0	2	2	.240	.321	.371	.692
12	Josh Hamilton J. Hamilton	7	42	163	18	33	9	0	6	23	15	0	30	4	1	181	60	15	0	3	5	.202	.265	.368	.633
13	Ryan Howard R. Howard	7	46	170	22	44	13	1	8	33	26	1	67	1	1	199	83	22	0	2	1	.259	.357	.488	.845
14	Miguel Cabrera M. Cabrera	7	55	205	29	57	10	0	13	38	27	2	48	3	0	235	106	23	1	0	7	.278	.368	.517	.885
15	Tino Martinez T. Martinez	7	99	356	44	83	15	0	9	38	41	6	72	3	2	405	125	24	0	2	1	.233	.321	.351	.672
16	David Justice D. Justice	7	112	398	55	89	17	2	14	63	64	5	79	3	2	471	152	33	0	4	7	.224	.335	.382	.717
17	Pedro Guerrero P. Guerrero	7	26	89	7	20	4	2	4	16	13	2	19	3	0	105	40	10	0	1	5	.225	.333	.449	.783
18	Pete Rose P. Rose	7	67	268	30	86	13	2	5	22	28	2	22	2	5	301	118	20	1	1	3	.321	.388	.440	.828
19	Vladimir Guerrero Jr. V. Guerrero Jr.	6	23	90	18	31	5	0	8	16	15	2	11	0	0	108	60	13	0	1	2	.344	.444	.667	1.111
20	Will Smith W. Smith	6	71	262	31	56	11	1	9	36	31	2	66	1	0	297	96	21	0	2	3	.214	.300	.366	.666
21	Yadier Molina Y. Molina	6	104	373	29	102	19	0	4	36	27	3	44	1	1	406	133	23	1	2	13	.273	.326	.357	.682
22	Lance Berkman L. Berkman	6	52	186	38	59	11	1	9	41	31	3	41	4	1	224	99	21	0	3	4	.317	.417	.532	.949
23	Mark McGwire M. McGwire	6	42	129	13	28	2	0	5	14	18	2	33	0	0	151	45	7	1	1	4	.217	.320	.349	.669
24	Eddie Murray E. Murray	6	44	159	21	41	3	1	9	25	27	0	27	3	1	186	73	13	0	0	2	.258	.366	.459	.825
25	George Brett G. Brett	6	43	166	30	56	8	5	10	23	17	0	20	2	3	184	104	23	0	1	4	.337	.397	.627	1.023