Jimmie Foxx had the best on-base percentage in 1939, with an on-base percentage of .464.

Interpreted as:

highest obp with a minimum of 3.1 PA per team game by a player in 1939

	NAME	OBP	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	GIDP	AVG	SLG	OPS	wRC	WRAA	wOBA	wRC+	BRAA
1	Jimmie Foxx J. Foxx	.464	1939	BSA	124	467	130	168	31	10	35	105	89	2	72	4	3	563	324	76	5	17	.360	.694	1.158	144	74.3	.507	181	63.5
2	George Selkirk G. Selkirk	.452	1939	NYY	128	418	103	128	17	4	21	101	103	8	49	12	5	537	216	42	8	3	.306	.517	.969	110	43.7	.444	151	38.1
3	Mel Ott M. Ott	.449	1939	NYG	125	396	85	122	23	2	27	80	100	1	50	2		508	230	52	11	5	.308	.581	1.030	111	48.5	.462	173	46.9
4	Joe DiMaggio J. DiMaggio	.448	1939	NYY	120	462	108	176	32	6	30	126	52	4	20	3	0	524	310	68	6	11	.381	.671	1.119	129	64	.495	180	58.5
5	Charlie Keller C. Keller	.447	1939	NYY	111	398	87	133	21	6	11	83	81	0	49	6	3	490	199	38	11	4	.334	.500	.947	97	36.5	.436	146	31.4
6	Johnny Mize J. Mize	.444	1939	SLN	153	564	104	197	44	14	28	108	92	4	49	0		670	353	86	10	9	.349	.626	1.070	154	71	.475	178	65.5
7	Bob Johnson B. Johnson	.440	1939	PHA	150	544	115	184	30	9	23	114	99	0	59	15	5	653	301	62	10	12	.338	.553	.993	137	55.7	.449	150	45.6
8	Ted Williams T. Williams	.436	1939	BSA	149	565	131	185	44	11	31	145	107	2	64	2	1	677	344	86	3	10	.327	.609	1.045	150	66.1	.464	156	53.1
9	Luke Appling L. Appling	.430	1939	CWS	148	516	82	162	16	6	0	56	105	0	37	16	9	630	190	22	9	11	.314	.368	.798	99	21.1	.385	114	12.2
10	Charlie Gehringer C. Gehringer	.423	1939	DET	118	406	86	132	29	6	16	86	68	1	16	4	3	486	221	51	11	7	.325	.544	.967	97	36.7	.437	138	25.6
11	Hank Greenberg H. Greenberg	.420	1939	DET	138	500	111	156	42	7	33	113	91	2	95	8	3	604	311	82	11	8	.312	.622	1.042	132	56.8	.460	151	43
12	Dolph Camilli D. Camilli	.409	1939	BKN	157	565	105	164	30	12	26	104	110	4	107	1		684	296	68	5	12	.290	.524	.933	128	43.7	.423	146	39.8
13	Joe Cronin J. Cronin	.407	1939	BSA	143	520	97	160	33	3	19	107	87	0	48	6	6	627	256	55	20	18	.308	.492	.899	112	34.5	.412	126	22.5
14	Hal Trosky Sr. H. Trosky Sr.	.405	1939	CLE	122	448	89	150	31	4	25	104	52	1	28	2	3	511	264	60	10	6	.335	.589	.994	105	41.2	.444	150	35.2
15	Red Rolfe R. Rolfe	.404	1939	NYY	152	648	139	213	46	10	14	80	81	1	41	7	6	731	321	70	1	6	.329	.495	.899	130	39.5	.411	131	31.9
16	Bill Dickey B. Dickey	.403	1939	NYY	128	480	98	145	23	3	24	105	77	4	37	5	0	565	246	50	4	9	.302	.513	.915	103	33.2	.416	135	27.3
17	Harlond Clift H. Clift	.402	1939	SLA	151	526	90	142	25	2	15	84	111	5	55	4	3	653	216	42	11	6	.270	.411	.813	102	21.3	.384	109	8
18	Buddy Lewis B. Lewis	.402	1939	WSH	140	536	87	171	23	16	10	75	72	2	27	10	9	629	256	49	19	7	.319	.478	.879	108	30.1	.403	128	24.3
19	Ival Goodman I. Goodman	.401	1939	CIN	124	470	85	152	37	16	7	84	54	7	32	2		553	242	60	22	6	.323	.515	.916	100	31.8	.415	147	32.8
20	Morrie Arnovich M. Arnovich	.397	1939	PHN	134	491	68	159	25	2	5	67	58	2	28	7		560	203	32	9	10	.324	.413	.811	86	16.4	.380	122	15.3
21	Augie Galan A. Galan	.392	1939	CHC	148	549	104	167	36	8	6	71	75	4	26	8		641	237	50	13	10	.304	.432	.823	100	20.3	.383	124	19
22	Mike Kreevich M. Kreevich	.390	1939	CWS	145	541	85	175	30	8	5	77	59	0	40	23	10	622	236	43	22	14	.323	.436	.826	97	19.6	.383	112	10.7
23	Ben Chapman B. Chapman	.390	1939	CLE	149	545	101	158	31	9	6	82	87	2	30	18	6	654	225	46	20	19	.290	.413	.802	98	16.9	.376	110	9.3
24	Zeke Bonura Z. Bonura	.388	1939	NYG	123	455	75	146	26	6	11	85	46	4	22	1		517	217	43	12	22	.321	.477	.865	86	21.8	.396	131	20.2
25	Billy Werber B. Werber	.388	1939	CIN	147	599	115	173	35	5	5	57	91	6	46	15		707	233	45	11	12	.289	.389	.777	101	13.6	.367	117	14.9