The Los Angeles Dodgers had the lowest ERA by a team in 2021, with an ERA of 3.01.

	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	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
2	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
3	Brewers	3.50	2021	162	.586	95	67	162	1,618	2	1	44	1436.0	1,156	558	623	168	537	77	19	5,990	60	10.14	3.37	3.01	1.05	27.0	9.0	1.18	.275	3.90	7.25
4	Rays	3.67	2021	162	.617	100	62	162	1,478	1	0	42	1455.2	1,264	593	651	184	436	55	27	5,998	64	9.14	2.70	3.39	1.14	24.6	7.3	1.17	.281	4.02	7.81
5	White Sox	3.73	2021	162	.574	93	69	162	1,588	4	3	43	1403.1	1,205	581	636	182	485	51	16	5,861	84	10.18	3.11	3.27	1.17	27.1	8.3	1.20	.288	4.08	7.73
6	Yankees	3.74	2021	162	.568	92	70	162	1,569	3	2	47	1435.1	1,243	596	669	196	492	56	10	5,999	85	9.84	3.08	3.19	1.23	26.2	8.2	1.21	.284	4.19	7.79
7	Astros	3.78	2021	162	.586	95	67	162	1,456	2	0	34	1445.0	1,231	607	658	187	549	70	12	6,060	72	9.07	3.42	2.65	1.16	24.0	9.1	1.23	.275	4.10	7.67
8	Braves	3.88	2021	161	.547	88	73	161	1,417	2	2	40	1410.2	1,237	608	656	183	516	66	34	5,944	73	9.04	3.29	2.75	1.17	23.8	8.7	1.24	.280	4.19	7.89
9	Mets	3.90	2021	162	.475	77	85	162	1,453	2	1	41	1379.1	1,221	597	668	190	475	70	21	5,785	53	9.48	3.10	3.06	1.24	25.1	8.2	1.23	.287	4.36	7.97
10	Blue Jays	3.91	2021	162	.562	91	71	162	1,468	1	1	34	1405.1	1,257	610	663	209	473	75	10	5,916	54	9.40	3.03	3.10	1.34	24.8	8.0	1.23	.284	4.25	8.05
11	Marlins	3.96	2021	162	.414	67	95	162	1,381	1	0	33	1415.0	1,282	622	701	162	529	88	43	6,027	58	8.78	3.36	2.61	1.03	22.9	8.8	1.28	.290	4.46	8.15
12	Cardinals	3.98	2021	162	.556	90	72	162	1,225	3	1	50	1417.0	1,234	626	672	152	608	85	30	6,046	66	7.78	3.86	2.01	0.97	20.3	10.1	1.30	.272	4.27	7.84
13	Athletics	4.02	2021	162	.531	86	76	162	1,332	3	3	39	1433.0	1,362	640	687	191	439	64	11	6,060	63	8.37	2.76	3.03	1.20	22.0	7.2	1.26	.290	4.31	8.55
14	Padres	4.10	2021	162	.488	79	83	162	1,517	2	2	43	1430.0	1,277	651	708	205	516	87	33	6,056	57	9.55	3.25	2.94	1.29	25.0	8.5	1.25	.287	4.46	8.04
15	Red Sox	4.26	2021	162	.568	92	70	162	1,527	0	0	49	1419.0	1,409	671	749	176	546	79	31	6,147	63	9.68	3.46	2.80	1.12	24.8	8.9	1.38	.323	4.75	8.94
16	Mariners	4.30	2021	162	.556	90	72	162	1,328	1	0	51	1440.1	1,356	688	748	197	485	69	23	6,106	58	8.30	3.03	2.74	1.23	21.7	7.9	1.28	.288	4.67	8.47
17	Tigers	4.32	2021	162	.475	77	85	162	1,259	2	1	42	1419.2	1,370	681	756	199	571	82	10	6,164	80	7.98	3.62	2.20	1.26	20.4	9.3	1.37	.289	4.79	8.69
18	Indians	4.34	2021	162	.494	80	82	162	1,391	0	0	39	1408.0	1,281	679	727	216	522	59	12	5,968	52	8.89	3.34	2.66	1.38	23.3	8.7	1.28	.282	4.65	8.19
19	Phillies	4.39	2021	162	.506	82	80	162	1,480	5	4	36	1418.2	1,321	692	745	200	509	75	37	6,055	49	9.39	3.23	2.91	1.27	24.4	8.4	1.29	.296	4.73	8.38
20	Reds	4.40	2021	162	.512	83	79	162	1,524	1	1	41	1434.1	1,330	702	760	206	617	64	30	6,199	62	9.56	3.87	2.47	1.29	24.6	10.0	1.36	.297	4.77	8.35
21	Royals	4.64	2021	162	.457	74	88	162	1,344	1	0	37	1417.1	1,375	731	788	189	591	62	16	6,127	86	8.53	3.75	2.27	1.20	21.9	9.6	1.39	.301	5.00	8.73
22	Angels	4.69	2021	162	.475	77	85	162	1,453	1	0	39	1421.2	1,373	741	804	188	592	76	18	6,196	56	9.20	3.75	2.45	1.19	23.5	9.6	1.38	.305	5.09	8.69
23	Rangers	4.79	2021	162	.370	60	102	162	1,239	0	0	31	1424.1	1,402	758	815	232	513	61	11	6,103	67	7.83	3.24	2.42	1.47	20.3	8.4	1.34	.288	5.15	8.86
24	Nationals	4.80	2021	162	.401	65	97	162	1,346	1	0	36	1394.1	1,364	743	820	247	548	71	46	6,073	43	8.69	3.54	2.46	1.59	22.2	9.0	1.37	.289	5.29	8.80
25	Rockies	4.82	2021	161	.460	74	87	161	1,269	3	1	33	1397.0	1,397	748	796	196	539	63	19	6,044	67	8.18	3.47	2.35	1.26	21.0	8.9	1.39	.302	5.13	9.00