The Baltimore Orioles have the most wins by a team in a month in the month of June, with 25 wins in June 1966.

	TEAM	W	MONTH	L	W%	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	25	June 1966	8	.758	33	1,185	189	336	58	10	40	178	108	4	154	5	12	1,322	534	108	13	12	13	32	.284	.342	.451	.793
2	Giants	24	June 1954	4	.857	28	969	139	261	41	4	30	136	98	8	112	9	7	1,100	400	75	15	10		17	.269	.338	.413	.751
3	Orioles	23	June 1979	6	.793	29	924	131	241	37	4	34	120	117	3	149	20	7	1,063	388	75	10	9	9	32	.261	.343	.420	.763
4	Indians	23	June 1963	12	.657	35	1,201	159	316	46	3	41	148	97	11	225	18	8	1,347	491	90	28	10	15	21	.263	.321	.409	.730
5	Yankees	22	June 2022	6	.786	28	919	155	216	36	2	58	151	122	12	236	20	4	1,062	430	96	2	7	10	19	.235	.330	.468	.798
6	Indians	22	June 2016	6	.786	28	947	143	256	45	10	44	134	76	7	199	26	5	1,047	453	99	8	9	2	21	.270	.326	.478	.805
7	Angels	22	June 1998	6	.786	28	989	173	290	52	5	35	155	88	15	185	4	7	1,112	457	92	13	7	10	27	.293	.358	.462	.820
8	Twins	22	June 1991	6	.786	28	962	144	268	45	5	31	137	83	11	120	27	8	1,073	416	81	8	9	9	12	.279	.340	.432	.772
9	Cardinals	22	June 1968	9	.710	31	1,078	122	275	47	6	21	115	70	10	176	16	8	1,182	397	74	16	8	15	13	.255	.304	.368	.673
10	Indians	22	June 1965	7	.759	29	978	129	259	33	2	36	112	91	5	140	27	6	1,100	404	71	19	7	18	19	.265	.328	.413	.741
11	White Sox	22	June 1961	10	.688	32	1,133	189	333	48	9	31	173	109	18	133	25	6	1,287	492	88	16	11	10	24	.294	.362	.434	.796
12	Yankees	22	June 1961	10	.688	32	1,130	184	298	44	6	53	173	97	5	166	6	3	1,249	513	103	6	11	4	20	.264	.322	.454	.776
13	Braves	22	June 1960	11	.667	33	1,111	164	291	49	15	36	150	110	6	167	14	9	1,254	478	100	10	17	11	17	.262	.327	.430	.757
14	Senators	22	June 1931	8	.733	30	1,064	192	318	60	20	9	177	101	9	65	19		1,190	445	89	16				.299	.365	.418	.783
15	Giants	22	June 1912	4	.846	26	884	217	299	59	21	13	186	99	12	84	68		1,028	439	93	33				.338	.412	.497	.909
16	Pirates	22	June 1908	8	.733	30	1,020	141	270	33	25	8		83	6		44		1,113	377	66	38				.265	.324	.370	.693
17	Beaneaters	22	June 1897	2	.917	24		226
18	Phillies	22	June 1892	5	.815	27		183
19	Braves	21	June 2023	4	.840	25	880	175	269	41	4	61	168	92	5	176	27	4	987	501	106	0	10	3	22	.306	.371	.569	.940
20	Braves	21	June 2022	6	.778	27	956	155	255	50	5	54	151	74	14	242	12	8	1,051	477	109	0	7	3	11	.267	.326	.499	.825
21	Dodgers	21	June 2017	7	.750	28	951	157	238	55	1	53	146	131	7	248	21	6	1,097	454	109	2	6	10	15	.250	.343	.477	.821
22	Rangers	21	June 2010	6	.778	27	979	178	304	57	7	32	170	93	9	174	16	7	1,099	471	96	7	11	7	17	.311	.372	.481	.853
23	Rockies	21	June 2009	7	.750	28	962	154	266	59	5	39	146	108	9	231	21	9	1,110	452	103	16	15	10	13	.277	.350	.470	.820
24	Braves	21	June 2002	5	.808	26	902	136	252	48	4	33	127	84	7	157	12	8	1,013	407	85	10	10	11	26	.279	.342	.451	.793
25	Athletics	21	June 2002	7	.750	28	940	147	249	60	2	33	143	108	10	187	2	4	1,071	412	95	5	8	9	22	.265	.344	.438	.783