Juan Soto has the most career walks by a player younger than 23, with 373 walks.

Interpreted as:

most walks before turning 23 years old by a player

	NAME	BB	G	AB	R	H	2B	3B	HR	RBI	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Juan Soto J. Soto	373	464	1,612	337	485	91	8	98	312	6	352	32	12	2,003	886	197	1	11	48	44	.301	.432	.550	.981
2	Mel Ott M. Ott	365	677	2,221	463	715	129	22	115	487	12	171	31		2,644	1,233	266	46				.322	.420	.555	.975
3	Ted Williams T. Williams	314	410	1,502	377	531	112	27	83	354	8	140	8		1,828	946	222	4			32	.354	.468	.630	1.097
4	Mickey Mantle M. Mantle	297	511	1,894	388	561	89	27	84	346	0	382	24	14	2,201	956	200	6	4		13	.296	.391	.505	.896
5	Bryce Harper B. Harper	279	510	1,830	328	528	98	15	97	248	13	449	37	16	2,143	947	210	9	12	23	33	.289	.384	.517	.902
6	Jimmie Foxx J. Foxx	272	517	1,650	368	560	94	38	86	379	4	197	22		1,976	988	218	50				.339	.434	.599	1.033
7	Eddie Mathews E. Mathews	270	440	1,583	286	441	75	17	112	296	5	261	17	10	1,874	886	204	9	7		25	.279	.384	.560	.944
8	Mike Trout M. Trout	247	445	1,695	336	527	105	22	87	277	22	426	98	12	1,987	937	214	0	23	15	21	.311	.401	.553	.953
9	Eddie Yost E. Yost	224	399	1,457	188	354	69	21	11	110	7	156	12		1,711	498	101	23			35	.243	.347	.342	.688
10	Ken Griffey Jr. K. Griffey Jr.	222	578	2,165	311	652	132	12	87	344	10	313	60	29	2,422	1,069	231	5	20	56	41	.301	.366	.494	.860
11	Al Kaline A. Kaline	218	622	2,314	352	710	103	25	82	365	10	200	34	24	2,575	1,109	210	14	19	23	59	.307	.366	.479	.846
12	Rickey Henderson R. Henderson	215	355	1,365	249	410	53	14	16	114	9	161	189	59	1,613	539	83	14	10	11	17	.300	.396	.395	.791
13	Buddy Lewis B. Lewis	210	550	2,301	387	695	105	38	35	298	9	146	39		2,563	981	178	43			5	.302	.363	.426	.789
14	Arky Vaughan A. Vaughan	197	430	1,628	271	524	85	40	25	252	13	87	23		1,870	764	150	32				.322	.399	.469	.869
15	Butch Wynegar B. Wynegar	194	428	1,520	170	382	65	6	24	193	10	166	3	3	1,761	531	95	25	12	14	32	.251	.338	.349	.687
16	Joe Morgan J. Morgan	190	288	1,058	166	291	35	19	19	81	6	125	32	17	1,270	421	73	10	6	4	5	.275	.387	.398	.784
17	Rusty Staub R. Staub	190	523	1,769	172	438	75	10	41	224	11	207	6	2	2,003	656	126	14	19	30	48	.248	.321	.371	.692
18	Andruw Jones A. Jones	188	522	1,740	264	455	94	15	84	263	18	376	75	29	1,962	831	193	6	10	21	37	.261	.338	.478	.816
19	Jason Heyward J. Heyward	186	378	1,310	200	340	67	11	50	168	16	332	35	13	1,519	579	128	0	7	7	23	.260	.357	.442	.799
20	Justin Upton J. Upton	182	411	1,485	223	403	80	19	60	203	11	437	37	17	1,692	701	159	1	13	17	36	.271	.352	.472	.825
21	Dick Kokos D. Kokos	182	357	1,249	197	336	70	9	45	184	7	196	15		1,445	559	124	7			15	.269	.365	.448	.813
22	Donie Bush D. Bush	180	317	1,082	218	292	31	7	3	71	7		102		1,360	346	41	91				.270	.377	.320	.697
23	Bob Bailey B. Bailey	178	470	1,768	226	446	71	10	34	151	6	279	31	32	1,974	639	115	15	7	4	43	.252	.322	.361	.683
24	Cass Michaels C. Michaels	175	504	1,650	166	413	47	16	11	171	12	139	35		1,868	525	74	31			44	.250	.327	.318	.645
25	Chris Speier C. Speier	173	383	1,448	180	371	53	11	29	156	12	220	15	14	1,651	533	93	10	8	9	29	.256	.339	.368	.707