Nathaniel Lowe had the most strikeouts in the 2023 postseason, with 22 strikeouts.

Interpreted as:

MLB postseason 2023 most strikeouts by a player

	NAME	SO	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Nathaniel Lowe N. Lowe	22	2023	TEX	17	66	10	14	2	0	3	6	6	0	0	0	72	25	5	0	0	0	0	.212	.278	.379	.657
2	Evan Longoria E. Longoria	21	2023	ARI	16	48	3	8	3	0	0	4	3	1	0	0	54	11	3	1	1	0	1	.167	.226	.229	.456
3	Gabriel Moreno G. Moreno	20	2023	ARI	17	63	6	15	1	0	4	12	6	0	0	0	70	28	5	1	0	0	1	.238	.304	.444	.749
4	Tommy Pham T. Pham	19	2023	ARI	16	61	10	17	3	0	3	4	2	0	2	0	64	29	6	0	1	0	2	.279	.297	.475	.772
5	Christian Walker C. Walker	19	2023	ARI	17	60	7	13	5	0	1	7	13	1	6	0	75	21	6	0	1	1	0	.217	.360	.350	.710
6	Josh Jung J. Jung	19	2023	TEX	17	65	13	20	4	1	3	8	3	0	0	0	70	35	8	0	2	0	4	.308	.329	.538	.867
7	Evan Carter E. Carter	19	2023	TEX	17	60	9	18	9	0	1	6	10	2	3	0	72	30	10	0	0	0	0	.300	.417	.500	.917
8	Ketel Marte K. Marte	18	2023	ARI	17	73	6	24	7	1	2	11	6	0	3	1	79	39	10	0	0	0	1	.329	.380	.534	.914
9	Adolis García A. García	18	2023	TEX	15	62	11	20	1	0	8	22	3	3	2	0	68	45	9	0	0	0	0	.323	.382	.726	1.108
10	Kyle Schwarber K. Schwarber	17	2023	PHI	13	47	9	12	4	0	5	6	9	1	0	0	57	31	9	0	0	2	1	.255	.386	.660	1.046
11	Geraldo Perdomo G. Perdomo	16	2023	ARI	17	51	10	14	0	0	2	4	7	0	3	2	63	20	2	5	0	0	0	.275	.362	.392	.754
12	Brandon Marsh B. Marsh	15	2023	PHI	12	38	2	13	4	0	1	4	4	0	2	0	42	20	5	0	0	0	1	.342	.405	.526	.931
13	Johan Rojas J. Rojas	15	2023	PHI	13	43	2	4	1	1	0	0	1	0	0	0	45	7	2	1	0	0	0	.093	.114	.163	.276
14	Nick Castellanos N. Castellanos	14	2023	PHI	13	47	7	10	2	0	5	7	4	0	1	0	52	27	7	0	1	1	0	.213	.269	.574	.844
15	Yordan Alvarez Y. Alvarez	14	2023	HOU	11	43	12	20	2	1	6	15	4	1	0	0	49	42	9	0	1	2	0	.465	.510	.977	1.487
16	Bryson Stott B. Stott	14	2023	PHI	13	46	5	11	1	0	1	9	4	0	5	0	51	15	2	0	1	0	1	.239	.294	.326	.620
17	J.T. Realmuto	13	2023	PHI	13	49	7	13	4	0	3	12	1	1	0	1	51	26	7	0	0	0	2	.265	.294	.531	.825
18	Lourdes Gurriel Jr. L. Gurriel Jr.	13	2023	ARI	17	66	5	18	3	0	3	11	2	0	2	0	70	30	6	1	1	1	3	.273	.290	.455	.744
19	Alek Thomas A. Thomas	13	2023	ARI	17	54	9	12	1	0	4	6	4	0	2	0	59	25	5	0	1	0	1	.222	.271	.463	.734
20	Corbin Carroll C. Carroll	13	2023	ARI	17	66	11	18	1	1	2	10	9	1	5	1	78	27	4	1	1	1	0	.273	.364	.409	.773
21	Leody Taveras L. Taveras	13	2023	TEX	17	57	8	10	1	1	1	3	10	0	4	0	67	16	3	0	0	0	0	.175	.299	.281	.579
22	Mitch Garver M. Garver	12	2023	TEX	14	53	8	12	2	0	3	14	6	1	0	0	60	23	5	0	0	1	6	.226	.317	.434	.751
23	Corey Seager C. Seager	12	2023	TEX	17	66	18	21	6	0	6	12	15	1	0	0	82	45	12	0	0	2	0	.318	.451	.682	1.133
24	Marcus Semien M. Semien	12	2023	TEX	17	76	12	17	2	1	2	10	6	0	0	0	82	27	5	0	0	0	1	.224	.280	.355	.636
25	Bryce Harper B. Harper	11	2023	PHI	13	42	14	12	0	0	5	8	13	0	3	1	55	27	5	0	0	2	2	.286	.455	.643	1.097