Mickey Cochrane has the best on-base percentage by a catcher in a season, with an on-base percentage of .459 in 1933.

Interpreted as:

highest catcher season obp with a minimum of 3.1 PA per team game

	NAME	OBP	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Mickey Cochrane M. Cochrane	.459	1933	PHA	130	429	104	138	30	4	15	60	106	3	22	8	6	542	221	49	4				.322	.515	.974	112	49.5	.449	155	39.5
2	Mickey Cochrane M. Cochrane	.452	1935	DET	115	411	93	131	33	3	5	46	96	4	15	5	5	522	185	41	11				.319	.450	.902	100	34.6	.423	138	27.4
3	Joe Mauer J. Mauer	.444	2009	MIN	138	523	94	191	30	1	28	96	76	2	63	4	1	606	307	59	0	5	14	13	.365	.587	1.031	127	54.8	.438	170	53.2
4	Mike Piazza M. Piazza	.431	1997	LAD	152	556	104	201	32	1	40	124	69	3	77	5	1	633	355	73	0	5	11	19	.362	.638	1.070	141	63.2	.452	183	66.4
5	Joe Mauer J. Mauer	.429	2006	MIN	140	521	86	181	36	4	13	84	79	1	54	8	3	608	264	53	0	7	21	24	.347	.507	.936	110	33.3	.396	141	32.6
6	Wally Schang W. Schang	.428	1921	NYY	134	424	77	134	30	5	6	53	78	5	35	7	4	513	192	41	6				.316	.453	.881	91	26.5	.411	128	19.7
7	Mickey Cochrane M. Cochrane	.428	1934	DET	129	437	74	140	32	1	2	75	78	4	26	8	4	524	180	35	5				.320	.412	.840	89	23.6	.397	124	17.4
8	Dick Dietz D. Dietz	.426	1970	SFG	148	493	82	148	36	2	22	107	109	3	106	0	1	612	254	60	2	5	10	16	.300	.515	.941	115	45.4	.415	152	39.3
9	Jorge Posada J. Posada	.426	2007	NYY	144	506	91	171	42	1	20	90	74	6	98	2	0	589	275	63	0	3	7	18	.338	.543	.970	116	42.8	.418	157	41.8
10	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
11	Mickey Cochrane M. Cochrane	.423	1931	PHA	122	459	87	160	31	6	17	89	56	3	21	2	3	521	254	54	3				.349	.553	.976	107	42.6	.441	151	36
12	Mike Piazza M. Piazza	.422	1996	LAD	148	547	87	184	16	0	36	105	81	1	93	0	3	631	308	52	0	2	21	21	.336	.563	.985	125	43.6	.416	165	51.5
13	Wilbert Robinson W. Robinson	.421	1894	BAL	109	414	69	146	21	4	1	98	46	3	18	12		474	178	26	11				.353	.430	.851	99	13	.406	108	7.4
14	Darrell Porter D. Porter	.421	1979	KCR	157	533	101	155	23	10	20	112	121	8	65	3	4	679	258	53	4	13	8	11	.291	.484	.905	120	40.6	.399	143	36.1
15	Roger Bresnahan R. Bresnahan	.419	1906	NYG	124	405	69	114	22	4	0	43	81	15	43	25		506	144	26	5				.281	.356	.775	77	27.1	.388	143	23.1
16	Mickey Tettleton M. Tettleton	.419	1994	DET	107	339	57	84	18	2	17	51	97	5	98	0	1	444	157	37	0	3	10	4	.248	.463	.882	76	20	.387	129	16.9
17	Fred Carroll F. Carroll	.418	1890	PTP	111	416	95	124	20	7	2	71	75	11	22	35		502	164	29					.298	.394	.813	104	27.5	.403	123	20.2
18	Brian Downing B. Downing	.418	1979	CAL	148	509	87	166	27	3	12	75	77	5	57	3	3	596	235	42	3	2	4	17	.326	.462	.880	103	33.6	.395	145	32.4
19	Bill Dickey B. Dickey	.417	1937	NYY	140	530	87	176	35	2	29	133	73	4	22	3	2	608	302	66	1				.332	.570	.987	125	48.8	.442	147	41.1
20	Jorge Posada J. Posada	.417	2000	NYY	151	505	92	145	35	1	28	86	107	8	151	2	2	624	266	64	0	4	10	11	.287	.527	.943	117	34.9	.405	140	33.8
21	Rudy York R. York	.417	1938	DET	135	463	86	138	27	2	33	126	92	2	74	1	2	557	268	62	0				.298	.579	.995	116	45.8	.445	138	30.8
22	Chris Hoiles C. Hoiles	.416	1993	BAL	126	419	80	130	28	0	29	82	69	9	94	1	1	503	245	57	3	3	4	10	.310	.585	1.001	103	43.2	.433	166	40.8
23	Joe Mauer J. Mauer	.416	2012	MIN	147	545	81	174	31	4	10	85	90	2	88	8	4	641	243	45	1	3	10	23	.319	.446	.861	104	31.2	.376	138	28.6
24	Gene Tenace G. Tenace	.415	1977	SDP	147	437	66	102	24	4	15	61	125	13	119	5	3	581	179	43	2	4	10	5	.233	.410	.824	91	23.2	.374	134	24.3
25	Joe Mauer J. Mauer	.413	2008	MIN	146	536	98	176	31	4	9	85	84	1	50	1	1	633	242	44	1	11	8	21	.328	.451	.864	103	26.4	.379	134	26.2