The Boston Red Sox had the best on-base percentage by a team in 2005, with an on-base percentage of .357.

	TEAM	OBP	SEASON	G	W%	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	SLG	OPS
1	Red Sox	.357	2005	162	.586	95	67	5,626	910	1,579	339	21	199	863	653	47	1,044	45	12	6,403	2,557	559	14	63	34	135	.281	.454	.811
2	Yankees	.355	2005	162	.586	95	67	5,624	886	1,552	259	16	229	847	637	73	989	84	27	6,405	2,530	504	28	43	41	125	.276	.450	.805
3	Phillies	.348	2005	162	.543	88	74	5,542	807	1,494	282	35	167	760	639	56	1,083	116	27	6,345	2,347	484	62	46	76	107	.270	.423	.772
4	Marlins	.339	2005	162	.512	83	79	5,502	717	1,499	306	32	128	678	512	67	918	96	38	6,213	2,253	466	82	50	61	144	.272	.409	.748
5	Cardinals	.339	2005	162	.617	100	62	5,538	805	1,494	287	26	170	757	534	62	947	83	36	6,246	2,343	483	77	35	60	127	.270	.423	.762
6	Reds	.339	2005	163	.451	73	89	5,565	820	1,453	335	15	222	784	611	62	1,303	72	23	6,320	2,484	572	43	39	42	116	.261	.446	.785
7	Indians	.334	2005	162	.574	93	69	5,609	790	1,522	337	30	207	760	503	54	1,093	62	36	6,255	2,540	574	39	50	33	128	.271	.453	.787
8	Rockies	.333	2005	162	.414	67	95	5,542	740	1,477	280	34	150	704	509	64	1,103	65	32	6,237	2,275	464	88	34	36	125	.267	.411	.744
9	Padres	.333	2005	162	.506	82	80	5,502	684	1,416	269	39	130	655	600	49	977	99	44	6,271	2,153	438	72	48	41	122	.257	.391	.724
10	Braves	.333	2005	162	.556	90	72	5,486	769	1,453	308	37	184	733	534	45	1,084	92	32	6,186	2,387	529	75	46	56	146	.265	.435	.768
11	Diamondbacks	.332	2005	162	.475	77	85	5,550	696	1,419	291	27	191	670	606	55	1,094	67	26	6,327	2,337	509	71	45	51	132	.256	.421	.754
12	Brewers	.331	2005	162	.500	81	81	5,448	726	1,413	327	19	175	689	531	73	1,162	79	34	6,156	2,303	521	66	38	55	137	.259	.423	.754
13	Blue Jays	.331	2005	162	.494	80	82	5,581	775	1,480	307	39	136	735	486	89	955	72	35	6,233	2,273	482	21	56	18	126	.265	.407	.738
14	Athletics	.330	2005	162	.543	88	74	5,627	772	1,476	310	20	155	739	537	52	819	31	22	6,275	2,291	485	19	40	22	148	.262	.407	.737
15	Rangers	.329	2005	162	.488	79	83	5,716	865	1,528	311	29	260	834	495	48	1,112	67	15	6,300	2,677	600	9	32	20	123	.267	.468	.798
16	Devil Rays	.329	2005	162	.414	67	95	5,552	750	1,519	289	40	157	717	412	69	990	151	49	6,118	2,359	486	34	51	25	133	.274	.425	.754
17	Orioles	.327	2005	162	.457	74	88	5,551	729	1,492	296	27	189	700	447	54	902	83	37	6,134	2,409	512	40	42	31	145	.269	.434	.761
18	Dodgers	.326	2005	162	.438	71	91	5,433	685	1,374	284	21	149	653	541	67	1,094	58	35	6,131	2,147	454	57	33	30	139	.253	.395	.721
19	Angels	.325	2005	162	.586	95	67	5,624	761	1,520	278	30	147	726	447	29	848	161	57	6,182	2,299	455	43	39	51	125	.270	.409	.734
20	Cubs	.324	2005	162	.488	79	83	5,584	703	1,506	323	23	194	674	419	50	920	65	39	6,159	2,457	540	69	37	49	131	.270	.440	.764
21	Twins	.323	2005	162	.512	83	79	5,564	688	1,441	269	32	134	644	485	59	978	102	44	6,192	2,176	435	42	42	49	155	.259	.391	.714
22	Pirates	.322	2005	162	.414	67	95	5,573	680	1,445	292	38	139	656	471	72	1,092	73	30	6,221	2,230	469	56	49	38	130	.259	.400	.723
23	Astros	.322	2005	163	.549	89	73	5,462	693	1,400	281	32	161	654	481	72	1,037	115	44	6,139	2,228	474	82	42	43	116	.256	.408	.730
24	White Sox	.322	2005	162	.611	99	63	5,529	741	1,450	253	23	200	713	435	79	1,002	137	67	6,145	2,349	476	53	49	27	122	.262	.425	.747
25	Nationals	.322	2005	162	.500	81	81	5,426	639	1,367	311	32	117	615	491	89	1,090	45	45	6,142	2,093	460	91	45	55	130	.252	.386	.708