The Arizona Diamondbacks had their best on-base percentage in a season in 1999, with an on-base percentage of .347.

Interpreted as:

highest on base percentage in a regular season dbacks

	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	Diamondbacks	.347	1999	162	.617	100	62	5,658	908	1,566	289	46	216	865	588	48	1,045	137	39	6,415	2,595	551	61	60	52	94	.277	.459	.805
2	Diamondbacks	.346	2002	162	.605	98	64	5,508	819	1,471	283	41	165	783	643	50	1,016	92	46	6,316	2,331	489	62	53	58	130	.267	.423	.769
3	Diamondbacks	.341	2001	162	.568	92	70	5,595	818	1,494	284	35	208	776	587	57	1,052	71	38	6,346	2,472	527	71	36	73	105	.267	.442	.783
4	Diamondbacks	.337	2024	162	.549	89	73	5,522	886	1,452	271	37	211	845	569	84	1,265	119	30	6,275	2,430	519	34	66	17	112	.263	.440	.777
5	Diamondbacks	.333	2000	162	.525	85	77	5,527	792	1,466	282	44	179	756	535	59	975	97	44	6,240	2,373	505	61	58	37	114	.265	.429	.763
6	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
7	Diamondbacks	.331	2006	162	.469	76	86	5,645	773	1,506	331	38	160	743	504	67	965	76	30	6,330	2,393	529	61	53	47	136	.267	.424	.755
8	Diamondbacks	.330	2025	71	.507	36	35	2,401	361	607	127	15	102	354	260	31	552	54	15	2,730	1,070	244	12	26	9	49	.253	.446	.776
9	Diamondbacks	.330	2003	162	.519	84	78	5,570	717	1,467	303	47	152	696	531	45	1,006	76	38	6,261	2,320	502	63	52	63	126	.263	.417	.746
10	Diamondbacks	.329	2017	162	.574	93	69	5,525	812	1,405	314	39	220	776	578	54	1,456	103	30	6,223	2,457	573	39	27	44	106	.254	.445	.774
11	Diamondbacks	.328	2012	162	.500	81	81	5,462	734	1,416	307	33	165	710	539	41	1,266	93	51	6,148	2,284	505	61	45	47	108	.259	.418	.746
12	Diamondbacks	.327	2008	162	.506	82	80	5,409	720	1,355	318	47	159	683	587	49	1,287	58	23	6,156	2,244	524	68	43	49	105	.251	.415	.742
13	Diamondbacks	.325	2010	162	.401	65	97	5,473	713	1,366	301	34	180	691	589	39	1,529	86	41	6,183	2,275	515	41	41	45	113	.250	.416	.740
14	Diamondbacks	.324	2009	162	.432	70	92	5,565	720	1,408	307	45	173	686	571	37	1,298	102	40	6,268	2,324	525	54	41	47	93	.253	.418	.742
15	Diamondbacks	.324	2015	162	.488	79	83	5,649	720	1,494	289	48	154	680	490	33	1,312	132	44	6,275	2,341	491	46	57	40	134	.264	.414	.738
16	Diamondbacks	.323	2013	162	.500	81	81	5,676	685	1,468	302	31	130	647	519	43	1,142	62	41	6,331	2,222	463	50	43	51	160	.259	.391	.715
17	Diamondbacks	.323	2019	162	.525	85	77	5,633	813	1,419	288	40	220	778	540	70	1,360	88	14	6,314	2,447	548	31	40	36	120	.252	.434	.757
18	Diamondbacks	.322	2011	162	.580	94	68	5,421	731	1,357	293	37	172	702	531	61	1,249	133	55	6,096	2,240	502	50	33	55	82	.250	.413	.736
19	Diamondbacks	.322	2023	162	.519	84	78	5,436	746	1,359	274	44	166	706	540	58	1,247	165	26	6,120	2,219	484	36	50	11	121	.250	.408	.730
20	Diamondbacks	.321	2007	162	.556	90	72	5,398	712	1,350	286	40	171	687	532	57	1,111	109	24	6,100	2,229	497	55	58	38	121	.250	.413	.734
21	Diamondbacks	.320	2016	162	.426	69	93	5,665	752	1,479	285	56	190	709	463	50	1,427	137	31	6,259	2,446	531	43	38	43	117	.261	.432	.752
22	Diamondbacks	.314	1998	162	.401	65	97	5,491	665	1,353	235	46	159	621	489	64	1,239	73	38	6,116	2,157	440	45	27	32	125	.246	.393	.707
23	Diamondbacks	.312	2020	60	.417	25	35	1,997	269	482	101	12	58	255	181	36	461	23	7	2,238	781	171	1	23	5	37	.241	.391	.704
24	Diamondbacks	.310	2004	162	.315	51	111	5,544	615	1,401	295	38	135	582	441	35	1,022	53	32	6,113	2,177	468	56	37	38	137	.253	.393	.703
25	Diamondbacks	.310	2018	162	.506	82	80	5,460	693	1,283	259	50	176	658	560	52	1,460	79	25	6,155	2,170	485	38	45	36	110	.235	.397	.707