Ted Williams has the best on-base percentage for the Red Sox in a season, with an on-base percentage of .553 in 1941.

Interpreted as:

best obp with a minimum of 1.55 PA per team game by red sox player in a season

	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	Ted Williams T. Williams	.553	1941	BSA	143	456	135	185	33	3	37	120	147	3	27	2	4	606	335	73	0			10	.406	.735	1.287	179	108.8	.568	221	96.9
2	Ted Williams T. Williams	.526	1957	BOS	132	420	96	163	28	1	38	87	119	5	43	0	1	546	307	67	0	2	33	11	.388	.731	1.257	148	87.3	.524	223	79
3	Ted Williams T. Williams	.513	1954	BOS	117	386	93	133	23	1	29	89	136	1	32	0	0	526	245	53	0	3		10	.345	.635	1.148	131	71.1	.507	207	65.5
4	Ted Williams T. Williams	.499	1942	BSA	150	522	141	186	34	5	36	137	145	4	51	3	2	671	338	75	0			12	.356	.648	1.147	168	96.2	.524	209	86.5
5	Ted Williams T. Williams	.499	1947	BSA	156	528	125	181	40	9	32	114	162	2	47	0	1	693	335	81	1			10	.343	.634	1.133	170	91.3	.508	207	86.2
6	Ted Williams T. Williams	.497	1946	BSA	150	514	142	176	37	8	38	123	156	2	44	0	0	672	343	83	0			12	.342	.667	1.164	166	95.8	.525	214	87.5
7	Ted Williams T. Williams	.497	1948	BSA	137	509	124	188	44	3	25	127	126	3	41	4	0	638	313	72	0			10	.369	.615	1.112	156	81	.504	184	68.8
8	Ted Williams T. Williams	.496	1955	BOS	98	320	77	114	21	3	28	83	91	2	24	2	0	417	225	52	0	4	17	8	.356	.703	1.200	107	58.6	.505	201	51.8
9	Ted Williams T. Williams	.490	1949	BSA	155	566	150	194	39	3	43	159	162	2	48	1	1	730	368	85	0			22	.343	.650	1.141	182	95.5	.511	187	82.2
10	Ted Williams T. Williams	.479	1956	BOS	136	400	71	138	28	2	24	82	102	1	39	0	0	503	242	54	0	0	11	13	.345	.605	1.084	116	57.5	.470	175	47.8
11	Wade Boggs W. Boggs	.476	1988	BOS	155	584	128	214	45	6	5	58	125	3	34	2	3	719	286	56	0	7	18	23	.366	.490	.965	141	62.7	.427	167	55.5
12	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
13	Tristram Speaker T. Speaker	.464	1912	BSA	153	580	136	222	53	12	10	90	82	6	36	52	28	675	329	75	7				.383	.567	1.031	154	73.6	.483	190	74.1
14	Ted Williams T. Williams	.464	1951	BSA	148	531	109	169	28	4	30	126	144	0	45	1	1	675	295	62	0			10	.318	.556	1.019	146	66.5	.463	166	55.4
15	Jimmie Foxx J. Foxx	.462	1938	BSA	149	565	139	197	33	9	50	175	119	0	76	5	4	685	398	92	1				.349	.704	1.166	178	91.7	.508	173	74.2
16	Wade Boggs W. Boggs	.461	1987	BOS	147	551	108	200	40	6	24	89	105	2	48	1	3	667	324	70	1	8	19	13	.363	.588	1.049	147	64.9	.443	171	60.2
17	Ted Williams T. Williams	.458	1958	BOS	129	411	81	135	23	2	26	85	98	4	49	1	0	517	240	51	0	4	12	19	.328	.584	1.042	110	52.2	.449	179	47.5
18	Babe Ruth B. Ruth	.456	1919	BSA	130	432	103	139	34	12	29	113	101	6	58	7		542	284	75	3				.322	.657	1.114	127	70.9	.509	203	65.5
19	Dale Alexander D. Alexander	.454	1932	BSA	101	376	58	140	27	3	8	56	55	1	19	4	5	432	197	38	0				.372	.524	.978	92	37.4	.443	153	31.9
20	Wade Boggs W. Boggs	.453	1986	BOS	149	580	107	207	47	2	8	71	105	0	44	0	4	693	282	57	4	4	14	11	.357	.486	.939	131	51.5	.414	154	45.1
21	Carl Yastrzemski C. Yastrzemski	.452	1970	BOS	161	566	125	186	29	0	40	102	128	1	66	23	13	697	335	69	0	2	12	12	.329	.592	1.044	152	73.5	.455	179	65.1
22	Ted Williams T. Williams	.452	1950	BSA	89	334	82	106	24	1	28	97	82	0	21	3	0	416	216	53	0			12	.317	.647	1.099	98	46.2	.482	166	37.5
23	Ted Williams T. Williams	.451	1960	BOS	113	310	56	98	15	0	29	72	75	3	41	1	1	390	200	44	0	2	7	7	.316	.645	1.096	90	45.8	.470	184	40.2
24	Wade Boggs W. Boggs	.450	1985	BOS	161	653	107	240	42	3	8	78	96	4	61	2	1	758	312	53	3	2	5	20	.368	.478	.928	144	57.7	.415	157	51.3
25	Manny Ramirez M. Ramirez	.450	2002	BOS	120	436	84	152	31	0	33	107	73	8	85	0	0	518	282	64	0	1	14	13	.349	.647	1.097	119	57.1	.459	185	54.3