Between the 2000 and 2023 seasons, the Los Angeles Dodgers had the best ERA by a team in a season, with an ERA of 2.80 in 2022.

	TEAM	ERA	SEASON	G	W%	W	L	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Dodgers	2.80	2022	162	.685	111	51	162	1,465	1	1	43	1451.1	1,114	451	513	152	407	75	13	5,865	38	9.08	2.52	3.60	0.94	25.0	6.9	1.05	.255	3.18	6.91
2	Astros	2.90	2022	162	.654	106	56	162	1,524	3	1	53	1445.1	1,121	465	518	134	458	60	6	5,856	56	9.49	2.85	3.33	0.83	26.0	7.8	1.09	.268	3.23	6.98
3	Cardinals	2.94	2015	162	.617	100	62	162	1,329	1	0	62	1464.2	1,359	478	525	123	477	45	37	6,134	48	8.17	2.93	2.79	0.76	21.7	7.8	1.25	.297	3.23	8.35
4	Dodgers	3.01	2021	162	.654	106	56	162	1,599	1	0	56	1452.0	1,107	486	561	161	486	63	43	5,948	52	9.91	3.01	3.29	1.00	26.9	8.2	1.10	.260	3.48	6.86
5	Phillies	3.02	2011	162	.630	102	60	162	1,299	18	7	47	1477.0	1,320	495	529	120	404	47	41	6,069	23	7.92	2.46	3.22	0.73	21.4	6.7	1.17	.286	3.22	8.04
6	Dodgers	3.02	2020	60	.717	43	17	60	517	0	0	15	538.2	424	181	213	66	145	21	4	2,172	24	8.64	2.42	3.57	1.10	23.8	6.7	1.06	.252	3.56	7.08
7	Nationals	3.03	2014	162	.593	96	66	162	1,288	5	4	45	1470.2	1,351	495	555	110	352	51	26	6,020	37	7.88	2.15	3.66	0.67	21.4	5.8	1.16	.294	3.40	8.27
8	Astros	3.11	2018	162	.636	103	59	162	1,687	2	2	46	1455.0	1,164	503	534	152	435	66	4	5,913	67	10.44	2.69	3.88	0.94	28.5	7.4	1.10	.283	3.30	7.20
9	Braves	3.13	2002	161	.631	101	59	161	1,058	3	2	57	1467.1	1,302	511	565	123	554	42	63	6,131	40	6.49	3.40	1.91	0.75	17.3	9.0	1.26	.271	3.47	7.99
10	Cubs	3.15	2016	162	.640	103	58	162	1,441	5	2	38	1459.2	1,125	511	556	163	495	63	24	5,933	80	8.88	3.05	2.91	1.01	24.3	8.3	1.11	.255	3.43	6.94
11	Dodgers	3.16	2003	162	.525	85	77	162	1,289	3	3	58	1457.2	1,254	511	556	127	526	40	35	6,001	50	7.96	3.25	2.45	0.78	21.5	8.8	1.22	.280	3.43	7.74
12	Mariners	3.17	2014	162	.537	87	75	162	1,317	2	1	51	1452.0	1,240	512	554	137	463	52	36	5,974	80	8.16	2.87	2.84	0.85	22.0	7.8	1.17	.275	3.43	7.69
13	Braves	3.18	2013	162	.593	96	66	162	1,232	1	0	53	1450.1	1,326	512	548	127	409	51	35	5,989	50	7.65	2.54	3.01	0.79	20.6	6.8	1.20	.288	3.40	8.23
14	Rays	3.19	2012	162	.556	90	72	162	1,383	7	4	50	1459.2	1,233	518	577	139	469	54	35	6,000	59	8.53	2.89	2.95	0.86	23.1	7.8	1.17	.277	3.56	7.60
15	Giants	3.20	2011	162	.531	86	76	162	1,316	3	2	52	1468.0	1,260	522	578	96	559	50	46	6,130	42	8.07	3.43	2.35	0.59	21.5	9.1	1.24	.283	3.54	7.72
16	Pirates	3.21	2015	162	.605	98	64	162	1,338	0	0	54	1489.2	1,392	532	596	110	453	75	38	6,215	67	8.08	2.74	2.95	0.66	21.5	7.3	1.24	.302	3.60	8.41
17	Athletics	3.22	2014	162	.543	88	74	162	1,244	7	3	31	1463.1	1,269	524	572	147	406	48	28	5,972	59	7.65	2.50	3.06	0.90	20.8	6.8	1.14	.272	3.52	7.80
18	Giants	3.24	2021	162	.660	107	55	162	1,425	2	2	56	1455.0	1,254	524	594	151	416	63	20	6,002	44	8.81	2.57	3.43	0.93	23.7	6.9	1.15	.279	3.67	7.76
19	Dodgers	3.25	2013	162	.568	92	70	162	1,292	7	4	46	1450.1	1,321	524	582	127	460	43	44	6,032	66	8.02	2.85	2.81	0.79	21.4	7.6	1.23	.291	3.61	8.20
20	Pirates	3.26	2013	162	.580	94	68	162	1,261	3	0	55	1470.2	1,299	533	577	101	515	70	26	6,147	81	7.72	3.15	2.45	0.62	20.5	8.4	1.23	.285	3.53	7.95
21	Padres	3.27	2014	162	.475	77	85	162	1,284	4	3	41	1438.2	1,300	523	577	117	462	46	32	6,006	57	8.03	2.89	2.78	0.73	21.4	7.7	1.22	.289	3.61	8.13
22	Indians	3.29	2020	60	.583	35	25	60	621	1	0	20	536.0	440	196	209	68	157	27	8	2,176	20	10.43	2.64	3.96	1.14	28.5	7.2	1.11	.285	3.51	7.39
23	Yankees	3.30	2022	162	.611	99	63	162	1,459	1	1	47	1451.2	1,177	532	567	157	444	65	10	5,938	40	9.05	2.75	3.29	0.97	24.6	7.5	1.12	.268	3.52	7.30
24	Indians	3.30	2017	162	.630	102	60	162	1,614	7	3	37	1440.2	1,267	529	564	163	406	45	15	5,866	48	10.08	2.54	3.98	1.02	27.5	6.9	1.16	.303	3.52	7.92
25	Nationals	3.33	2012	162	.605	98	64	162	1,325	3	1	51	1468.1	1,296	543	594	129	497	47	32	6,133	62	8.12	3.05	2.67	0.79	21.6	8.1	1.22	.282	3.64	7.94