most strikeouts in a season by starting pitcher

Sandy Koufax has struck out the most batters by a starting pitcher in a season, with 380 strikeouts in 1965.

	NAME	SO	SEASON	TM	G	W	L	W%	GS	ERA	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Sandy Koufax S. Koufax	380	1965	LAD	41	26	8	.765	41	2.05	27	8	0	333.2	215	76	90	26	71	5	0	4	1,290	11	10.25	1.92	5.35	0.70	29.5	5.5	0.86	.234	2.43	5.80
2	Nolan Ryan N. Ryan	379	1973	CAL	39	21	16	.568	39	2.84	26	4	0	323.2	235	102	111	18	160	7	0	2	1,344	14	10.54	4.45	2.37	0.50	28.2	11.9	1.22	.278	3.09	6.53
3	Nolan Ryan N. Ryan	366	1974	CAL	41	21	16	.568	41	2.85	26	3	0	331.0	218	105	125	16	202	9	0	3	1,384	9	9.95	5.49	1.81	0.44	26.4	14.6	1.27	.255	3.40	5.93
4	Randy Johnson R. Johnson	364	1999	ARI	35	17	9	.654	35	2.48	12	2	0	271.2	207	75	86	30	70	9	0	3	1,079	4	12.06	2.32	5.20	0.99	33.7	6.5	1.02	.292	2.85	6.86
5	Randy Johnson R. Johnson	356	2001	ARI	34	20	6	.769	34	2.56	3	2	0	242.2	180	69	74	19	70	18	0	2	971	8	13.20	2.60	5.09	0.70	36.7	7.2	1.03	.317	2.74	6.68
6	Rube Waddell R. Waddell	349	1904	PHA	46	25	19	.568	46	1.62	39	8	0	383.0	307	69	109	5	91	14	0			8	8.20	2.14	3.84	0.12		6.4	1.04	.312	2.56	7.21
7	Randy Johnson R. Johnson	347	2000	ARI	35	19	7	.731	35	2.64	8	3	0	248.2	202	73	89	23	76	6	0	1	1,001	5	12.56	2.75	4.57	0.83	34.7	7.6	1.12	.326	3.22	7.31
8	Nolan Ryan N. Ryan	341	1977	CAL	37	19	16	.543	37	2.77	22	4	0	299.0	198	92	110	12	204	9	0	7	1,272	21	10.26	6.14	1.67	0.36	26.8	16.0	1.34	.263	3.31	5.96
9	Randy Johnson R. Johnson	334	2002	ARI	35	24	5	.828	35	2.32	8	4	0	260.0	197	67	78	26	71	13	0	1	1,035	3	11.56	2.46	4.70	0.90	32.3	6.9	1.03	.289	2.70	6.82
10	Bob Feller B. Feller	333	1946	CLE	42	26	15	.634	42	2.11	36	10	0	359.0	271	84	95	11	148	3	0		1,462	2	8.35	3.71	2.25	0.28	22.8	10.1	1.17	.269	2.38	6.79
11	Randy Johnson R. Johnson	329	1998	TOT	34	19	11	.633	34	3.28	10	6	0	244.1	203	89	102	23	86	14	0	1	1,014	7	12.12	3.17	3.83	0.85	32.4	8.5	1.18	.320	3.76	7.48
12	Nolan Ryan N. Ryan	329	1972	CAL	39	19	16	.543	39	2.28	20	9	0	284.0	166	72	80	14	157	10	0	4	1,154	18	10.43	4.98	2.10	0.44	28.5	13.6	1.14	.236	2.54	5.26
13	Nolan Ryan N. Ryan	327	1976	CAL	39	17	18	.486	39	3.36	21	7	0	284.1	193	106	117	13	183	5	0	2	1,195	5	10.35	5.79	1.79	0.41	27.4	15.3	1.32	.270	3.70	6.11
14	Gerrit Cole G. Cole	326	2019	HOU	33	20	5	.800	33	2.50	0	0	0	212.1	142	59	66	29	48	3	0	0	817	4	13.82	2.03	6.79	1.23	39.9	5.9	0.89	.275	2.80	6.02
15	Curt Schilling C. Schilling	319	1997	PHI	35	17	11	.607	35	2.97	7	2	0	254.1	208	84	96	25	58	5	0	3	1,009	5	11.29	2.05	5.50	0.88	31.6	5.7	1.05	.304	3.40	7.36
16	Sandy Koufax S. Koufax	317	1966	LAD	41	27	9	.750	41	1.73	27	5	0	323.0	241	62	74	19	77	0	0	4	1,274	7	8.83	2.15	4.12	0.53	24.9	6.0	0.98	.258	2.06	6.72
17	Curt Schilling C. Schilling	315	2002	ARI	35	23	7	.767	35	3.14	5	1	0	258.1	215	90	92	28	33	3	0	1	1,011	6	10.97	1.15	9.55	0.98	31.2	3.3	0.96	.296	3.21	7.49
18	J.R. Richard	313	1979	HOU	38	18	13	.581	38	2.71	19	4	0	292.1	220	88	98	13	98	3	0	5	1,175	19	9.64	3.02	3.19	0.40	26.6	8.3	1.09	.277	3.02	6.77
19	Sam McDowell S. McDowell	311	1965	CLE	35	16	11	.593	35	2.29	14	3	0	259.1	170	66	80	9	129	6	0	6	1,066	17	10.79	4.48	2.41	0.31	29.2	12.1	1.15	.264	2.78	5.90
20	Steve Carlton S. Carlton	310	1972	PHI	41	27	10	.730	41	1.97	30	8	0	346.1	257	76	84	17	87	1	0	8	1,351	8	8.06	2.26	3.56	0.44	22.9	6.4	0.99	.256	2.18	6.68
21	Chris Sale C. Sale	308	2017	BOS	32	17	8	.680	32	2.90	1	0	0	214.1	165	69	73	24	43	8	0	0	851	3	12.93	1.81	7.16	1.01	36.2	5.1	0.97	.301	3.07	6.93
22	Mickey Lolich M. Lolich	308	1971	DET	45	25	14	.641	45	2.92	29	4	0	376.0	336	122	133	36	92	7	0	2	1,538	7	7.37	2.20	3.35	0.86	20.0	6.0	1.14	.274	3.18	8.04
23	Walter Johnson W. Johnson	308	1910	WSH	42	24	16	.600	42		38	8	0	361.2	259		89	1	76	12	0		1,388	21	7.66	1.89	4.05	0.02	22.2	5.5	0.93	.260	2.21	6.45
24	Pedro Martinez P. Martinez	306	1999	BOS	29	22	4	.846	29	2.07	5	1	0	208.1	157	48	55	8	36	8	0	1	816	6	13.22	1.56	8.50	0.35	37.5	4.4	0.93	.325	2.38	6.78
25	Mike Scott M. Scott	306	1986	HOU	37	18	10	.643	37	2.22	7	5	0	275.1	182	68	73	17	72	2	0	6	1,065	3	10.00	2.35	4.25	0.56	28.7	6.8	0.92	.247	2.39	5.95