Between the 1940 and 1949 seasons, Mike Garcia had the lowest ERA, with an ERA of 2.33.

Interpreted as:

lowest era with a minimum of 0.5 IP per team game by a player in 1940's

	NAME	ERA	G	W	L	W%	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Mike Garcia M. Garcia	2.33	42	14	5	.737	20	95	8	5	2	177.2	157	46	51	6	60	2	10	727	1	4.81	3.04	1.58	0.30	13.1	8.3	1.22	.268	2.58	58	2.93	73	7.95	21.8
2	Sal Maglie S. Maglie	2.35	13	5	4	.556	10	32	7	3	0	84.1	72	22	22	2	22	2	1	341	0	3.42	2.35	1.45	0.21	9.4	6.5	1.11	.247	2.35	61	2.94	78	7.68	7.8
3	Butch Wensloff B. Wensloff	2.60	41	16	13	.552	32	125	19	1	1	276.2	222	80	99	11	95	1	5	1,128	2	4.07	3.09	1.32	0.36	11.1	8.4	1.15	.235	3.22	77	3.09	89	7.22	10.6
4	Spud Chandler S. Chandler	2.67	165	85	34	.714	151	543	89	22	6	1211.2	1,039	359	425	49	387	16	9	4,939	18	4.03	2.87	1.40	0.36	11.0	7.8	1.18	.251	3.16	72	3.14	87	7.72	61
5	Max Lanier M. Lanier	2.68	194	77	47	.621	128	588	63	16	11	1030.2	922	307	373	23	365	10	39	4,258	9	5.13	3.19	1.61	0.20	13.8	8.6	1.25	.275	3.26	73	2.77	75	8.05	102.2
6	Arnold Carter A. Carter	2.72	46	13	11	.542	24	37	11	4	3	195.1	197	59	75	3	53	5	15	826	1	1.70	2.44	0.70	0.14	4.5	6.4	1.28	.266	3.46	76	3.25	92	9.08	6.2
7	Joe Beggs J. Beggs	2.73	224	45	33	.577	32	170	19	4	29	635.1	619	193	243	32	169	4	124	2,638	4	2.41	2.39	1.01	0.45	6.4	6.4	1.24	.259	3.44	77	3.43	97	8.77	5.9
8	Harry Brecheen H. Brecheen	2.74	216	105	59	.640	172	666	101	22	12	1388.0	1,242	422	480	68	378	27	30	5,662	14	4.32	2.45	1.76	0.44	11.8	6.7	1.17	.260	3.11	72	3.06	80	8.05	115.8
9	Ray Prim R. Prim	2.75	77	19	14	.576	26	125	9	2	4	248.2	237	76	99	16	47	1	29	1,022	4	4.52	1.70	2.66	0.58	12.2	4.6	1.14	.265	3.58	78	2.91	83	8.58	16.7
10	Satchel Paige S. Paige	2.78	52	10	8	.556	12	97	4	2	6	155.2	131	48	50	6	55	2	24	643	1	5.61	3.18	1.76	0.35	15.1	8.6	1.19	.259	2.89	69	2.93	74	7.57	18.6
11	Hal Newhouser H. Newhouser	2.84	377	170	118	.590	305	1,579	181	31	15	2453.1	2,127	774	927	84	1,068	10	56	10,360	52	5.79	3.92	1.48	0.31	15.2	10.3	1.30	.268	3.40	72	3.01	77	7.80	237.2
12	Bob Feller B. Feller	2.90	266	137	82	.626	231	1,396	155	28	16	1897.0	1,539	611	677	95	827	22	27	7,880	30	6.62	3.92	1.69	0.45	17.7	10.5	1.25	.261	3.21	76	3.11	83	7.30	133.9
13	Mort Cooper M. Cooper	2.93	246	114	68	.626	210	772	120	31	9	1606.1	1,441	523	598	77	462	25	26	6,627	24	4.33	2.59	1.67	0.43	11.6	7.0	1.18	.258	3.35	79	3.09	84	8.07	101
14	Claude Passeau C. Passeau	2.94	258	111	85	.566	207	646	130	21	12	1693.2	1,704	554	665	65	426	17	38	7,149	17	3.43	2.26	1.52	0.35	9.0	6.0	1.26	.273	3.53	84	3.07	87	9.05	88.7
15	Tex Hughson T. Hughson	2.94	225	96	54	.640	156	693	99	19	17	1375.2	1,270	450	504	77	372	11	51	5,663	5	4.53	2.43	1.86	0.50	12.2	6.6	1.19	.265	3.30	79	3.01	82	8.31	98.8
16	Bob Lemon B. Lemon	2.97	149	57	34	.626	90	389	49	13	7	834.2	669	275	313	39	431	13	38	3,510	15	4.19	4.65	0.90	0.42	11.1	12.3	1.32	.239	3.38	78	3.82	100	7.21	-2.2
17	Bucky Walters B. Walters	2.97	246	122	90	.575	238	677	153	28	3	1868.1	1,724	616	726	92	631	24	6	7,778	28	3.26	3.04	1.07	0.44	8.7	8.1	1.26	.257	3.50	84	3.53	99	8.30	5.6
18	Ted Lyons T. Lyons	2.97	69	39	28	.582	69	195	61	7	0	596.2	592	197	241	39	109	6	0	2,478	11	2.94	1.64	1.79	0.59	7.9	4.4	1.17	.260	3.64	74	3.40	88	8.93	32
19	Wally Hebert W. Hebert	2.98	34	10	11	.476	23	41	12	1	0	184.0	197	61	75	3	45	2	9	785	1	2.01	2.20	0.91	0.15	5.2	5.7	1.32	.280	3.67	86	2.95	86	9.64	9.6
20	Howie Pollet H. Pollet	2.99	204	83	49	.629	145	508	82	18	8	1157.0	1,107	385	449	52	397	17	26	4,875	21	3.95	3.09	1.28	0.40	10.4	8.1	1.30	.270	3.49	78	3.27	86	8.61	69.6
21	Dizzy Trout D. Trout	3.01	374	129	119	.520	239	930	132	27	22	2026.1	1,944	678	821	74	746	21	93	8,587	36	4.13	3.31	1.25	0.33	10.8	8.7	1.33	.274	3.65	78	3.21	85	8.63	133.3
22	Mace Brown M. Brown	3.02	174	31	21	.596	17	165	5	1	26	397.0	367	133	155	16	170	3	100	1,674	11	3.74	3.85	0.97	0.36	9.9	10.2	1.35	.266	3.51	81	3.63	98	8.32	4.5
23	Hank Wyse H. Wyse	3.03	198	69	54	.561	133	321	63	11	8	1063.0	1,105	358	432	50	268	15	38	4,452	9	2.72	2.27	1.20	0.42	7.2	6.0	1.29	.278	3.66	85	3.29	93	9.36	25.5
24	Whit Wyatt W. Wyatt	3.04	151	72	49	.595	144	498	71	15	1	1014.2	903	343	406	47	280	16	5	4,191	3	4.42	2.48	1.78	0.42	11.9	6.7	1.17	.256	3.60	84	3.09	84	8.01	66.3
25	Warren Spahn W. Spahn	3.04	142	65	41	.613	126	462	72	14	5	990.1	897	335	388	67	294	6	12	4,089	17	4.20	2.67	1.57	0.61	11.3	7.2	1.20	.255	3.53	81	3.38	89	8.15	47.4