The Pittsburgh Pirates have the highest batting average by a team in a game, with an average of .628 against the Reds on April 27, 1912.

Interpreted as:

highest ba as a team in one regular-season game

	TEAM	AVG	DATE	TM		OPP	RESULT	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	OBP	SLG	OPS
1	Pirates	.628	4/27/1912	PIT	vs	CIN	W 23-4	43	23	27	5	3	0	20	5	0	1	8		51	38	8	3				.667	.884	1.550
2	Naps	.615	7/1/1905	CLE	vs	DET	W 14-3	39	14	24	3	3	0		3	1	1	2		44	33	6	1				.651	.846	1.497
3	Red Sox	.609	6/27/2003	BOS	vs	FLA	W 25-8	46	25	28	8	1	3	25	7	1	7	0	0	57	47	12	0	3	0	1	.632	1.022	1.653
4	Athletics	.605	5/18/1912	PHA	vs	DET	W 24-2	43	24	26	4	6	0	22	7	0	1	10		52	42	10	2				.660	.977	1.637
5	Robins	.600	6/10/1922	BKN	vs	CHC	W 13-0	40	13	24	2	2	0	13	1	1	0	1	0	46	30	4	4				.619	.750	1.369
6	Hoosiers	.600	8/16/1914	IND	vs	PTF	W 21-6	40	21	24	4	2	0	17	8	0	0	13		51	32	6	3				.667	.800	1.467
7	Cardinals	.591	8/22/2008	STL	vs	ATL	W 18-3	44	18	26	5	0	0	18	9	0	6	0	2	55	31	5	1	1	2	1	.648	.705	1.353
8	Tigers	.586	6/30/1912	DET	vs	CWS	W 11-9	29	11	17	2	0	2	10	2	0	1	0		36	25	4	5				.613	.862	1.475
9	Giants	.574	8/5/1922	NYG	vs	CHC	W 19-7	47	19	27	6	4	0	17	4	1	2	1	2	53	41	10	1				.615	.872	1.488
10	Twins	.571	6/13/2017	MIN	vs	SEA	W 20-7	49	20	28	2	0	5	19	2	0	4	0	0	51	45	7	0	0	0	1	.588	.918	1.507
11	Robins	.571	6/23/1930	BKN	@	PIT	W 19-6	49	19	28	6	1	3	17	3	0	6	1	0	54	45	10	2				.596	.918	1.515
12	Tigers	.571	9/15/1901	DET	vs	CLE	W 21-0	42	21	24	8	0	1	20	3	2	1	1	-10	49	35	9	2		-10	-10	.617	.833	1.450
13	Indians	.565	8/7/1923	CLE	@	WSH	W 22-2	46	22	26	3	4	0	19	8	0	2	0	1	56	37	7	2				.630	.804	1.434
14	Athletics	.561	7/9/1928	PHA	vs	CLE	W 14-4	41	14	23	8	0	0	14	3	0	2	0	0	46	31	8	2				.591	.756	1.347
15	Cardinals	.561	8/31/1921	SLN	@	PHN	W 12-5	41	12	23	4	0	1	10	2	0	1	1	3	44	30	5	1				.581	.732	1.313
16	Indians	.559	8/13/1980	CLE	vs	TEX	W 14-3	34	14	19	2	1	0	14	4	0	2	2	0	42	23	3	0	4	0	2	.548	.676	1.224
17	Padres	.558	4/19/1982	SDP	vs	SFG	W 13-6	43	13	24	5	0	1	12	1	0	2	2	1	45	32	6	1	0	0	3	.568	.744	1.312
18	Indians	.558	7/28/1925	CLE	@	BSA	W 16-7	43	16	24	6	0	0	16	3	1	0	0	0	52	30	6	5				.596	.698	1.293
19	Indians	.558	7/7/1923	CLE	vs	BSA	W 27-3	43	27	24	5	2	0	25	14	1	1	4	2	61	33	7	3				.672	.767	1.440
20	Browns	.558	9/17/1920	SLA	vs	PHA	W 17-8	43	17	24	4	2	0	17	6	0	1	2	2	49	32	6	0				.612	.744	1.356
21	Athletics	.558	5/1/1929	PHA	@	BSA	W 24-6	52	24	29	6	0	3	23	6	1	4	1	2	60	44	9	1				.610	.846	1.456
22	Cardinals	.556	8/24/1924	SLN	vs	BKN	W 17-0	45	17	25	6	3	0	17	2	0	4	0	1	49	37	9	2				.574	.822	1.397
23	Pirates	.556	6/8/1921	PIT	vs	BSN	W 16-4	45	16	25	5	1	0	12	4	0	1	0	1	50	32	6	1				.592	.711	1.303
24	Red Sox	.553	8/15/2015	BOS	vs	SEA	W 22-10	47	22	26	7	0	4	22	6	1	3	1	0	57	45	11	0	3	0	1	.579	.957	1.536
25	White Sox	.553	4/23/1981	CWS	vs	BAL	W 18-5	47	18	26	2	2	1	17	6	0	2	0	0	55	35	5	1	1	0	1	.593	.745	1.337