The Baltimore Orioles have the highest batting average by a team in a decade, with an average of .298 in the 1890s.

	TEAM	AVG	R	DECADE	G	W%	W	L	AB	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	OBP	SLG	OPS
1	Orioles	.298	8,530	1890s	1,294	.579	730	530	45,361	13,521	1,814	865	218	6,940	4,345	992	2,952	2,993		51,317	17,719	2,897	619				.372	.391	.763
2	Tigers	.295	8,260	1920s	1,553	.494	760	778	53,537	15,803	2,773	873	527	7,414	5,615	314	4,076	968		61,575	21,903	4,173	2,109				.365	.409	.775
3	Indians	.295	7,773	1920s	1,538	.512	786	749	52,991	15,630	3,111	693	410	7,052	5,035	388	3,654	746		60,476	21,357	4,214	2,062				.360	.403	.763
4	Pirates	.294	7,836	1920s	1,543	.572	877	656	53,754	15,817	2,426	1,042	486	7,090	4,219	290	3,615	1,268		59,986	21,785	3,954	1,723				.349	.405	.754
5	Phillies	.294	9,078	1890s	1,392	.542	743	629	50,233	14,746	2,328	855	428	7,648	4,721	620	3,094	2,294		56,245	20,068	3,611	671				.361	.399	.761
6	Giants	.291	8,005	1920s	1,536	.582	890	639	53,651	15,637	2,448	703	931	7,316	4,440	308	4,398	965		59,829	22,284	4,082	1,430				.349	.415	.764
7	Cardinals	.291	7,870	1920s	1,541	.536	822	712	53,742	15,649	2,739	830	848	7,204	4,488	294	4,561	885		60,210	22,592	4,417	1,686				.349	.420	.769
8	Yankees	.291	8,487	1920s	1,540	.608	933	602	52,872	15,385	2,584	802	1,211	7,824	5,462	281	5,379	695		60,413	23,206	4,597	1,798				.360	.439	.799
9	White Stockings	.291	1,798	1870s	270	.583	154	110	10,470	3,044	468	114	14		288					10,758	3,782	596						.361
10	Browns	.290	7,762	1920s	1,541	.498	762	769	53,050	15,385	2,702	752	710	6,952	4,719	333	4,042	884		60,053	21,721	4,164	1,951				.352	.409	.761
11	Yankees	.288	9,695	1930s	1,541	.636	970	554	54,172	15,596	2,715	750	1,546	9,070	7,025	281	5,587	822		62,323	24,449	5,011	845			99	.373	.451	.824
12	Beaneaters	.287	9,231	1890s	1,395	.631	869	508	49,644	14,245	1,980	698	513	7,709	4,863	530	2,928	2,429		55,727	19,160	3,191	690				.357	.386	.743
13	Senators	.287	8,140	1930s	1,542	.527	806	722	54,839	15,712	2,786	861	548	7,547	5,512	250	4,325	733		61,655	21,864	4,195	1,054			103	.354	.399	.753
14	Indians	.286	8,246	1930s	1,543	.538	824	708	54,143	15,511	3,123	728	888	7,677	5,222	200	4,971	616		60,585	22,754	4,739	1,020			110	.351	.420	.772
15	Infants	.285	849	1890s	131	.423	55	75	4,804	1,370	213	94	27	701	509	49	345	180		5,362	1,852	334					.360	.386	.745
16	Orioles	.285	1,476	1900s	276	.435	118	153	9,349	2,666	381	218	57	1,231	786	106	797	396		10,459	3,654	656	218				.347	.391	.738
17	Cardinals	.285	7,906	1930s	1,549	.566	869	665	54,739	15,609	3,085	672	858	7,334	4,232	228	5,273	763		60,227	22,612	4,615	1,028			116	.339	.413	.752
18	Senators	.285	7,411	1920s	1,541	.519	792	735	52,661	14,995	2,467	849	387	6,616	5,010	435	4,227	1,170		60,077	20,321	3,703	1,971				.352	.386	.738
19	Reds	.284	6,794	1920s	1,541	.521	798	735	52,340	14,856	2,261	908	338	6,120	4,044	317	3,426	1,042		58,641	19,947	3,507	1,940				.339	.381	.720
20	Pirates	.284	7,254	1930s	1,536	.531	812	718	54,042	15,332	2,619	822	567	6,730	4,550	208	4,268	474		59,913	21,296	4,008	1,113			128	.342	.394	.736
21	Rockies	.284	5,732	1990s	1,071	.478	512	559	37,059	10,513	1,947	293	1,333	5,425	3,316	350	6,628	837	423	41,526	17,045	3,573	508	293	255	868	.346	.460	.806
22	Giants	.284	1,018	1890s	132	.565	74	57	4,913	1,393	204	97	66	793	486	31	364	231		5,430	1,989	367					.352	.405	.757
23	Cubs	.283	7,363	1920s	1,543	.526	807	728	52,782	14,948	2,527	597	726	6,700	4,640	318	4,741	1,030		59,616	20,847	3,850	1,876				.345	.395	.740
24	Tigers	.283	8,399	1930s	1,541	.533	818	716	54,104	15,304	2,945	689	947	7,786	5,781	216	5,346	908		61,077	22,468	4,581	976			125	.354	.415	.770
25	Grays	.282	965	1870s	147	.639	92	52	5,690	1,607	249	85	20		141					5,831	2,086	354						.367