The Baltimore Orioles had their highest winning percentage in a season in 1969, winning 67.3 percent of the time.

	TEAM	W%	SEASON	W	L	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Orioles	.673	1969	109	53	162	5,518	779	1,465	234	29	175	722	634	43	806	82	45	6,328	2,282	438	74	59	62	138	.265	.343	.414	.756
2	Orioles	.667	1970	108	54	162	5,545	792	1,424	213	25	179	748	717	44	952	84	39	6,416	2,224	417	64	46	64	110	.257	.344	.401	.745
3	Orioles	.642	1979	102	57	159	5,371	757	1,401	258	24	181	717	608	31	847	99	49	6,106	2,250	463	42	54	52	143	.261	.336	.419	.755
4	Orioles	.639	1971	101	57	158	5,303	742	1,382	207	25	158	702	672	46	844	66	38	6,143	2,113	390	85	37	69	127	.261	.347	.398	.745
5	Orioles	.623	2023	101	61	162	5,495	807	1,399	309	28	183	780	512	45	1,370	114	24	6,120	2,313	520	21	47	14	114	.255	.321	.421	.742
6	Orioles	.617	1980	100	62	162	5,585	805	1,523	258	29	156	751	587	21	766	111	38	6,281	2,307	443	42	46	38	158	.273	.342	.413	.755
7	Orioles	.606	1966	97	63	160	5,529	755	1,426	243	35	175	703	514	39	926	55	43	6,199	2,264	453	82	35	59	119	.258	.324	.409	.733
8	Orioles	.605	1997	98	64	162	5,584	812	1,498	264	22	196	780	586	65	952	63	26	6,340	2,394	482	46	59	44	121	.268	.341	.429	.770
9	Orioles	.605	1983	98	64	162	5,546	799	1,492	283	27	168	761	601	23	800	61	33	6,272	2,333	478	46	56	48	144	.269	.340	.421	.761
10	Browns	.604	1922	93	61	154	5,425	868	1,684	292	94	98	785	471	35	380	136	75	6,130	2,458	484	199				.310	.369	.453	.822
11	Orioles	.602	1977	97	64	161	5,494	719	1,433	231	25	148	677	560	24	945	90	51	6,173	2,158	404	48	47	50	132	.261	.329	.393	.722
12	Orioles	.599	1973	97	65	162	5,537	754	1,474	229	48	119	692	648	43	752	146	64	6,335	2,156	396	58	49	49	126	.266	.345	.389	.734
13	Orioles	.599	1964	97	65	163	5,463	679	1,357	229	20	162	632	537	27	1,019	78	38	6,143	2,112	411	69	47	55	126	.248	.316	.387	.703
14	Orioles	.593	2014	96	66	162	5,596	705	1,434	264	16	211	681	401	62	1,285	44	20	6,130	2,363	491	35	36	29	112	.256	.311	.422	.734
15	Orioles	.586	1961	95	67	163	5,481	691	1,393	227	36	149	638	581	23	902	39	30	6,211	2,139	412	78	48	25	140	.254	.326	.390	.716
16	Orioles	.580	1982	94	68	163	5,557	774	1,478	259	27	179	735	634	25	796	49	38	6,325	2,328	465	57	52	52	141	.266	.341	.419	.760
17	Orioles	.580	1965	94	68	162	5,450	641	1,299	227	38	125	596	529	28	907	67	31	6,138	1,977	390	95	36	61	139	.238	.307	.363	.670
18	Orioles	.578	1960	89	65	154	5,170	682	1,307	206	33	123	640	596	36	800	37	24	5,911	1,948	362	72	37	36	127	.253	.332	.377	.709
19	Browns	.578	1944	89	65	154	5,269	684	1,328	223	45	72	629	530	21	603	44	33	5,927	1,857	340	107			86	.252	.323	.352	.675
20	Orioles	.574	2012	93	69	162	5,560	712	1,375	270	16	214	677	480	50	1,315	58	29	6,158	2,319	500	38	30	24	152	.247	.311	.417	.728
21	Browns	.574	1902	78	58	140	4,736	619	1,254	208	61	29	520	373	38	324	137		5,251	1,671	298	104				.265	.323	.353	.676
22	Orioles	.566	1975	90	69	159	5,474	682	1,382	224	33	124	635	580	38	834	104	55	6,211	2,044	381	73	46	55	114	.252	.326	.373	.699
23	Orioles	.563	1994	63	49	112	3,856	589	1,047	185	20	139	557	438	39	655	69	13	4,384	1,689	344	16	35	23	89	.272	.349	.438	.787
24	Orioles	.562	1981	59	46	105	3,516	429	883	165	11	88	408	404	15	454	41	34	3,985	1,334	264	26	24	29	110	.251	.329	.379	.708
25	Orioles	.562	2024	91	71	162	5,567	786	1,391	262	33	235	759	489	64	1,359	98	25	6,171	2,424	530	6	45	15	71	.250	.315	.435	.751