The Baltimore Orioles have 4 series losses in the World Series all-time.

	TEAM	DATE	SERIES L	SEASON	SERIES	TM		OPP	RESULT	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Browns	10/4/1944	0	1944	World Series	SLA	@	SLN	W 2-1	29	2	2	0	0	1	2	3	0	6	0	0	32	5	1	0		0	0	.069	.156	.172	.329
2	Browns	10/5/1944	0	1944	World Series	SLA	@	SLN	L 2-3	40	2	7	3	0	0	2	4	0	13	0	0	44	10	3	0		1	0	.175	.250	.250	.500
3	Browns	10/6/1944	0	1944	World Series	SLA	vs	SLN	W 6-2	31	6	8	2	0	0	4	5	0	5	0	0	36	10	2	0		1	1	.258	.361	.323	.684
4	Browns	10/7/1944	0	1944	World Series	SLA	vs	SLN	L 1-5	34	1	9	1	0	0	0	4	0	4	0	0	38	10	1	0		0	2	.265	.342	.294	.636
5	Browns	10/8/1944	0	1944	World Series	SLA	vs	SLN	L 0-2	34	0	7	2	0	0	0	2	0	12	0	0	36	9	2	0		0	0	.206	.250	.265	.515
6	Browns	10/9/1944	1	1944	World Series	SLA	@	SLN	L 1-3	29	1	3	1	1	0	1	5	0	9	0	0	35	6	2	1		1	0	.103	.235	.207	.442
7	Orioles	10/5/1966	0	1966	World Series	BAL	@	LAD	W 5-2	35	5	9	2	0	2	5	5	0	3	0	0	41	17	4	1	0	1	0	.257	.350	.486	.836
8	Orioles	10/6/1966	0	1966	World Series	BAL	@	LAD	W 6-0	34	6	8	1	1	0	3	4	0	5	0	0	39	11	2	1	0	1	1	.235	.316	.324	.639
9	Orioles	10/8/1966	0	1966	World Series	BAL	vs	LAD	W 1-0	25	1	3	0	0	1	1	1	0	4	0	0	26	6	1	0	0	0	2	.120	.154	.240	.394
10	Orioles	10/9/1966	0	1966	World Series	BAL	vs	LAD	W 1-0	26	1	4	0	0	1	1	1	0	5	0	1	27	7	1	0	0	0	1	.154	.185	.269	.454
11	Orioles	10/11/1969	0	1969	World Series	BAL	vs	NYM	W 4-1	30	4	6	1	0	1	4	2	0	6	0	0	32	10	2	0	0	0	0	.200	.250	.333	.583
12	Orioles	10/12/1969	0	1969	World Series	BAL	vs	NYM	L 1-2	29	1	2	0	0	0	1	3	0	4	1	0	32	2	0	0	0	0	0	.069	.156	.069	.225
13	Orioles	10/14/1969	0	1969	World Series	BAL	@	NYM	L 0-5	31	0	4	0	0	0	0	7	0	7	0	0	38	4	0	0	0	0	0	.129	.289	.129	.419
14	Orioles	10/15/1969	0	1969	World Series	BAL	@	NYM	L 1-2	35	1	6	0	0	0	1	2	0	6	0	1	38	6	0	0	1	0	0	.171	.211	.171	.382
15	Orioles	10/16/1969	1	1969	World Series	BAL	@	NYM	L 3-5	32	3	5	0	0	2	3	1	0	5	0	0	33	11	2	0	0	0	0	.156	.182	.344	.526
16	Orioles	10/10/1970	0	1970	World Series	BAL	@	CIN	W 4-3	33	4	7	1	0	3	4	3	0	11	0	0	36	17	4	0	0	1	1	.212	.278	.515	.793
17	Orioles	10/11/1970	0	1970	World Series	BAL	@	CIN	W 6-5	35	6	10	1	0	1	6	5	0	5	0	0	40	14	2	0	0	0	2	.286	.375	.400	.775
18	Orioles	10/13/1970	0	1970	World Series	BAL	vs	CIN	W 9-3	31	9	10	3	0	3	9	5	0	4	0	2	36	22	6	0	0	1	0	.323	.417	.710	1.126
19	Orioles	10/14/1970	0	1970	World Series	BAL	vs	CIN	L 5-6	34	5	8	0	0	1	4	2	0	8	0	0	37	11	1	1	0	0	0	.235	.278	.324	.601
20	Orioles	10/15/1970	0	1970	World Series	BAL	vs	CIN	W 9-3	38	9	15	2	0	2	9	5	0	5	0	0	44	23	4	1	0	1	0	.395	.465	.605	1.070
21	Orioles	10/9/1971	0	1971	World Series	BAL	vs	PIT	W 5-3	34	5	10	0	1	3	5	1	0	6	0	0	35	21	4	0	0	0	0	.294	.314	.618	.932
22	Orioles	10/11/1971	0	1971	World Series	BAL	vs	PIT	W 11-3	36	11	14	0	0	0	10	7	1	2	0	0	44	14	0	0	0	0	0	.389	.500	.389	.889
23	Orioles	10/12/1971	0	1971	World Series	BAL	@	PIT	L 1-5	30	1	3	0	0	1	1	2	0	8	0	0	32	6	1	0	0	0	0	.100	.156	.200	.356
24	Orioles	10/13/1971	0	1971	World Series	BAL	@	PIT	L 3-4	28	3	4	1	0	0	2	1	3	4	0	0	34	5	1	0	2	1	1	.143	.235	.179	.414
25	Orioles	10/14/1971	0	1971	World Series	BAL	@	PIT	L 0-4	27	0	2	0	0	0	0	2	0	2	0	0	29	2	0	0	0	0	2	.074	.138	.074	.212
	Total		4							1,261	135	267	41	4	33	122	125	6	240	5	5	1,407	415	78	8	7	15	27	.212	.284	.329	.614