Babe Ruth had the best on-base percentage in the AL in 1930, with an on-base percentage of .493.

Interpreted as:

best obp with a minimum of 3.1 PA per team game by a player in the al in 1930

	NAME	OBP	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	AVG	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Babe Ruth B. Ruth	.493	1930	NYY	145	518	150	186	28	9	49	153	136	1	61	10	10	676	379	86	21	.359	.732	1.225	192	97	.517	204	100.6
2	Lou Gehrig L. Gehrig	.473	1930	NYY	154	581	143	220	42	17	41	173	101	3	63	12	14	703	419	100	18	.379	.721	1.194	193	94.5	.507	198	98.3
3	Jimmie Foxx J. Foxx	.429	1930	PHA	153	562	127	188	33	13	37	156	93	0	66	7	7	673	358	83	18	.335	.637	1.066	156	61	.458	159	57
4	Max Bishop M. Bishop	.426	1930	PHA	130	441	117	111	27	6	10	38	128	6	60	3	2	588	180	43	13	.252	.408	.834	102	19.4	.393	119	15.9
5	Earle Combs E. Combs	.424	1930	NYY	137	532	129	183	30	22	7	82	74	0	26	16	10	617	278	59	11	.344	.523	.947	123	36.1	.422	145	39.4
6	Mickey Cochrane M. Cochrane	.424	1930	PHA	130	487	110	174	42	5	10	85	55	1	18	5	0	561	256	57	18	.357	.526	.949	113	33.7	.423	138	30.4
7	Al Simmons A. Simmons	.423	1930	PHA	138	554	152	211	41	16	36	165	39	1	34	9	2	611	392	93	17	.381	.708	1.130	153	67.4	.480	173	63.8
8	Joe Cronin J. Cronin	.422	1930	WSH	154	587	127	203	41	9	13	126	72	5	36	17	10	686	301	63	22	.346	.513	.934	135	38.1	.418	139	37.9
9	Dick Porter D. Porter	.420	1930	CLE	119	480	100	168	43	8	4	57	55	3	31	3	3	552	239	55	14	.350	.498	.918	106	28	.413	130	23.2
10	Jimmy Dykes J. Dykes	.414	1930	PHA	125	435	69	131	28	4	6	73	74	10	53	3	3	535	185	38	16	.301	.425	.840	91	16	.389	117	12.8
11	Ed Morgan E. Morgan	.413	1930	CLE	150	584	122	204	47	11	26	136	62	1	66	8	4	666	351	84	19	.349	.601	1.014	143	49.7	.440	146	43.9
12	Joe Judge J. Judge	.410	1930	WSH	126	442	83	144	29	11	10	80	60	3	29	13	6	515	225	50	10	.326	.509	.919	97	24.8	.410	134	24.6
13	Sam Rice S. Rice	.407	1930	WSH	147	593	121	207	35	13	1	73	55	3	14	13	8	668	271	49	17	.349	.457	.864	116	21.9	.393	123	21.7
14	Charlie Gehringer C. Gehringer	.404	1930	DET	154	610	144	201	47	15	16	98	69	7	17	19	15	699	326	78	13	.330	.534	.938	135	36.3	.414	133	33.1
15	Earl Averill E. Averill	.404	1930	CLE	139	534	102	181	33	8	19	119	56	2	48	10	7	605	287	60	13	.339	.537	.941	117	32	.415	131	26.7
16	Marty McManus M. McManus	.396	1930	DET	132	484	74	155	40	4	9	89	59	2	28	23	8	561	230	53	16	.320	.475	.872	97	18.3	.392	120	15.7
17	Carl Reynolds C. Reynolds	.388	1930	CWS	138	563	103	202	25	18	22	104	20	7	39	16	4	602	329	65	12	.359	.584	.973	120	35.4	.422	143	36.9
18	Johnny Hodapp J. Hodapp	.386	1930	CLE	154	635	111	225	51	8	9	121	32	1	29	6	5	687	319	68	19	.354	.502	.889	121	23.8	.395	118	17.8
19	Heinie Manush H. Manush	.385	1930	TOT	137	554	100	194	49	12	9	94	31	0	24	7	4	602	294	70	17	.350	.531	.915	110	25	.402	128	23.7
20	Earl Webb E. Webb	.385	1930	BSA	127	449	61	145	30	6	16	66	44	1	56	2	1	506	235	52	12	.323	.523	.908	91	19.9	.400	128	20.5
21	Goose Goslin G. Goslin	.382	1930	TOT	148	584	115	180	36	12	37	138	67	3	54	17	11	668	351	85	14	.308	.601	.983	133	39	.421	138	36.3
22	Johnny Watwood J. Watwood	.382	1930	CWS	133	427	75	129	25	4	2	51	52	3	35	5	7	496	168	31	14	.302	.393	.775	71	1.6	.359	104	2.9
23	Buddy Myer B. Myer	.373	1930	WSH	138	541	97	164	18	8	2	61	58	2	31	14	11	617	204	28	16	.303	.377	.750	83	-3.9	.348	95	-4.1
24	Harry Rice H. Rice	.372	1930	TOT	137	474	78	142	23	5	9	98	50	5	29	3	6	543	202	37	14	.300	.426	.799	80	3.8	.364	107	5.2
25	Tony Lazzeri T. Lazzeri	.372	1930	NYY	143	571	109	173	34	15	9	121	60	3	62	4	4	650	264	58	16	.303	.462	.835	102	10.4	.374	115	13.9