The Colorado Rockies had the highest ERA by a team in 2023, with an ERA of 5.67.

	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	Rockies	5.67	2023	162	.364	59	103	162	1,129	0	0	31	1414.0	1,599	891	957	234	586	86	13	6,316	51	7.19	3.73	1.93	1.49	17.9	9.3	1.55	.319	6.09	10.18
2	Athletics	5.48	2023	162	.309	50	112	162	1,300	0	0	28	1419.2	1,464	865	924	213	694	100	33	6,384	76	8.24	4.40	1.87	1.35	20.4	10.9	1.52	.307	5.86	9.28
3	Royals	5.17	2023	162	.346	56	106	162	1,270	3	0	28	1409.0	1,429	809	859	207	553	73	8	6,139	67	8.11	3.53	2.30	1.32	20.7	9.0	1.41	.303	5.49	9.13
4	Nationals	5.02	2023	162	.438	71	91	162	1,225	0	0	42	1428.1	1,512	797	845	245	592	66	25	6,285	54	7.72	3.73	2.07	1.54	19.5	9.4	1.47	.305	5.32	9.53
5	White Sox	4.87	2023	162	.377	61	101	162	1,470	2	0	28	1431.2	1,372	774	841	214	654	91	14	6,301	64	9.24	4.11	2.25	1.35	23.3	10.4	1.42	.299	5.29	8.62
6	Reds	4.83	2023	162	.506	82	80	162	1,381	0	0	53	1439.1	1,426	772	821	222	613	81	13	6,310	48	8.64	3.83	2.25	1.39	21.9	9.7	1.42	.300	5.13	8.92
7	Cardinals	4.79	2023	162	.438	71	91	162	1,215	0	0	36	1428.1	1,549	760	829	179	530	63	6	6,273	62	7.66	3.34	2.29	1.13	19.4	8.4	1.46	.320	5.22	9.76
8	Angels	4.66	2023	162	.451	73	89	162	1,445	1	1	42	1431.2	1,395	742	829	209	636	88	41	6,305	70	9.08	4.00	2.27	1.31	22.9	10.1	1.42	.302	5.21	8.77
9	Pirates	4.60	2023	162	.469	76	86	162	1,363	2	2	47	1430.0	1,380	731	790	179	596	81	25	6,238	57	8.58	3.75	2.29	1.13	21.8	9.6	1.38	.299	4.97	8.69
10	Red Sox	4.52	2023	162	.481	78	84	162	1,423	0	0	42	1430.0	1,416	718	776	208	497	83	21	6,168	49	8.96	3.13	2.86	1.31	23.1	8.1	1.34	.305	4.88	8.91
11	Diamondbacks	4.48	2023	162	.519	84	78	162	1,351	1	1	44	1435.1	1,375	714	761	197	525	48	13	6,100	40	8.47	3.29	2.57	1.24	22.1	8.6	1.32	.296	4.77	8.62
12	Mets	4.31	2023	162	.463	75	87	162	1,397	1	0	34	1416.1	1,332	678	729	190	595	85	13	6,115	59	8.88	3.78	2.35	1.21	22.8	9.7	1.36	.297	4.63	8.46
13	Rangers	4.28	2023	162	.556	90	72	162	1,351	3	1	29	1436.1	1,330	683	716	198	491	59	19	6,025	46	8.47	3.08	2.75	1.24	22.4	8.1	1.27	.288	4.49	8.33
14	Tigers	4.24	2023	162	.481	78	84	162	1,374	0	0	41	1442.1	1,320	680	740	187	476	50	8	6,073	51	8.57	2.97	2.89	1.17	22.6	7.8	1.25	.284	4.62	8.24
15	Marlins	4.21	2023	162	.519	84	78	162	1,490	3	1	43	1435.1	1,340	672	723	191	514	71	20	6,091	38	9.34	3.22	2.90	1.20	24.5	8.4	1.29	.300	4.53	8.40
16	Braves	4.15	2023	162	.642	104	58	162	1,516	1	1	52	1440.0	1,342	664	716	187	534	70	14	6,135	56	9.48	3.34	2.84	1.17	24.7	8.7	1.30	.302	4.47	8.39
17	Cubs	4.08	2023	162	.512	83	79	162	1,377	1	1	35	1435.1	1,328	651	723	179	513	64	5	6,085	57	8.63	3.22	2.68	1.12	22.6	8.4	1.28	.291	4.53	8.33
18	Dodgers	4.07	2023	162	.617	100	62	162	1,388	0	0	42	1446.1	1,285	654	699	200	454	73	20	6,018	49	8.64	2.83	3.06	1.24	23.1	7.5	1.20	.278	4.35	8.00
19	Phillies	4.03	2023	162	.556	90	72	162	1,454	1	1	45	1442.1	1,318	646	715	185	470	54	6	6,074	35	9.07	2.93	3.09	1.15	23.9	7.7	1.24	.290	4.46	8.22
20	Giants	4.02	2023	162	.488	79	83	162	1,359	4	2	47	1434.2	1,395	641	719	173	403	71	22	6,039	60	8.53	2.53	3.37	1.09	22.5	6.7	1.25	.303	4.51	8.75
21	Yankees	3.97	2023	162	.506	82	80	162	1,439	3	3	44	1439.2	1,272	635	698	195	508	85	6	6,078	60	9.00	3.18	2.83	1.22	23.7	8.4	1.24	.280	4.36	7.95
22	Guardians	3.96	2023	162	.469	76	86	162	1,311	1	0	47	1444.0	1,352	635	697	173	534	51	9	6,144	61	8.17	3.33	2.46	1.08	21.3	8.7	1.31	.289	4.34	8.43
23	Astros	3.94	2023	162	.556	90	72	162	1,460	2	2	41	1445.1	1,312	632	698	201	537	75	6	6,110	37	9.09	3.34	2.72	1.25	23.9	8.8	1.28	.290	4.35	8.17
24	Orioles	3.89	2023	162	.623	101	61	162	1,431	0	0	49	1453.2	1,334	629	678	177	473	63	16	6,098	64	8.86	2.93	3.03	1.10	23.5	7.8	1.24	.293	4.20	8.26
25	Twins	3.87	2023	162	.537	87	75	162	1,560	2	2	38	1451.1	1,294	624	659	194	443	63	16	6,028	51	9.67	2.75	3.52	1.20	25.9	7.3	1.20	.292	4.09	8.02