James Harden has the most turnovers in a season with 464 turnovers in 2016-17.

Interpreted as:

most turnovers by a player in a season

NAME	TOV	SEASON	TM	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	PF	+/-
James Harden	464	2016-17	HOU	81	36.4	29.1	8.1	11.2	1.5	0.5	5.7	8.3	18.9	44.0	3.2	9.3	34.7	9.2	10.9	84.7	2,947	2,356	659	907	121	38	215	+425
Russell Westbrook	438	2016-17	OKC	81	34.6	31.6	10.7	10.4	1.6	0.4	5.4	10.2	24.0	42.5	2.5	7.2	34.3	8.8	10.4	84.5	2,802	2,558	864	840	132	31	190	+251
James Harden	387	2018-19	HOU	78	36.8	36.1	6.6	7.5	2.0	0.7	5.0	10.8	24.5	44.2	4.8	13.2	36.8	9.7	11.0	87.9	2,867	2,818	518	586	158	58	244	+357
Russell Westbrook	381	2017-18	OKC	80	36.4	25.4	10.1	10.3	1.8	0.3	4.8	9.5	21.1	44.9	1.2	4.1	29.8	5.2	7.1	73.7	2,914	2,028	804	820	147	20	200	+383
James Harden	374	2015-16	HOU	82	38.1	29.0	6.1	7.5	1.7	0.6	4.6	8.7	19.7	43.9	2.9	8.0	35.9	8.8	10.2	86.0	3,125	2,376	501	612	139	51	229	+125
Artis Gilmore	366	1977-78	CHI	82	37.4	22.9	13.1	3.2	0.5	2.2	4.5	8.6	15.4	55.9				5.7	8.2	70.4	3,067	1,879	1,071	263	42	181	261
Kevin Porter	360	1977-78	TOT	82	34.3	15.0	2.6	10.2	1.5	0.2	4.4	6.0	12.9	46.9				3.0	3.9	76.3	2,813	1,234	214	837	123	15	283
Micheal Ray Richardson	359	1979-80	NYK	82	37.3	15.3	6.6	10.1	3.2	0.4	4.4	6.1	13.0	47.2	0.3	1.3	24.5	2.7	4.1	66.0	3,060	1,254	539	832	265	35	260
Ricky Sobers	352	1977-78	IND	79	38.2	18.2	4.1	7.4	2.2	0.3	4.5	7.0	15.5	45.3				4.2	5.1	82.5	3,019	1,436	327	584	170	23	308
Charles Barkley	350	1985-86	PHI	80	36.9	20.0	12.8	3.9	2.2	1.6	4.4	7.4	13.0	57.2	0.2	0.9	22.7	5.0	7.2	68.5	2,952	1,603	1,026	312	173	125	333
Reggie Theus	348	1979-80	CHI	82	36.9	20.2	4.0	6.3	1.4	0.2	4.2	6.9	14.3	48.3	0.3	1.3	26.7	6.1	7.3	83.8	3,029	1,660	329	515	114	20	262
LeBron James	347	2017-18	CLE	82	36.9	27.5	8.6	9.1	1.4	0.9	4.2	10.5	19.3	54.2	1.8	5.0	36.7	4.7	6.5	73.1	3,026	2,251	709	747	116	71	136	+104
George McGinnis	346	1978-79	DEN	76	33.6	22.6	11.4	3.7	1.7	0.7	4.6	7.9	16.8	47.4				6.7	10.1	66.5	2,552	1,715	864	283	129	52	321
Bob McAdoo	346	1977-78	NYK	79	40.3	26.5	12.8	3.8	1.3	1.6	4.4	10.3	19.8	52.0				5.9	8.2	72.7	3,182	2,097	1,010	298	105	126	297
Ron Harper	345	1986-87	CLE	82	37.4	22.9	4.8	4.8	2.5	1.0	4.2	9.0	19.7	45.5	0.2	1.1	21.3	4.7	6.9	68.4	3,064	1,874	392	394	209	84	247
Allen Iverson	344	2004-05	PHI	75	42.3	30.7	4.0	7.9	2.4	0.1	4.6	10.3	24.2	42.4	1.4	4.5	30.8	8.7	10.5	83.5	3,174	2,302	299	596	180	9	140	+12
Isiah Thomas	343	1986-87	DET	81	37.2	20.6	3.9	10.0	1.9	0.2	4.2	7.7	16.7	46.3	0.2	1.2	19.4	4.9	6.4	76.8	3,013	1,671	319	813	153	20	251
Russell Westbrook	342	2015-16	OKC	80	34.4	23.5	7.8	10.4	2.0	0.3	4.3	8.2	18.1	45.4	1.3	4.3	29.6	5.8	7.2	81.2	2,749	1,878	626	834	163	20	200	+635
Jeff Ruland	342	1983-84	WAS	75	41.1	22.2	12.3	3.9	0.9	1.0	4.6	8.0	13.8	57.9	0.0	0.1	14.3	6.2	8.5	73.3	3,082	1,665	922	296	68	72	285
Allen Iverson	337	1996-97	PHI	76	40.1	23.5	4.1	7.5	2.1	0.3	4.4	8.2	19.8	41.6	2.0	6.0	34.1	5.0	7.2	70.2	3,045	1,787	312	567	157	24	233	-439
Kevin Porter	337	1978-79	DET	82	37.4	15.4	2.5	13.4	1.9	0.1	4.1	6.5	13.5	48.1				2.3	3.2	72.2	3,064	1,260	209	1,099	158	5	302
Ray Williams	335	1982-83	KCK	72	30.1	15.4	4.5	7.9	1.7	0.4	4.7	5.8	14.8	39.2	0.2	1.0	20.3	3.6	4.6	76.9	2,170	1,109	327	569	120	26	248
Jim Jackson	334	1993-94	DAL	82	37.4	19.2	4.7	4.6	1.1	0.3	4.1	7.8	17.5	44.5	0.2	0.7	28.3	3.5	4.2	82.1	3,066	1,576	388	374	87	25	161
Jason Kidd	328	1995-96	DAL	81	37.5	16.6	6.8	9.7	2.2	0.3	4.0	6.1	16.0	38.1	1.6	4.9	33.6	2.8	4.1	69.2	3,034	1,348	553	783	175	26	155
Reggie Theus	327	1985-86	SAC	82	35.6	18.3	3.7	9.6	1.4	0.2	4.0	6.7	13.9	48.0	0.1	0.4	17.1	4.9	6.0	82.7	2,919	1,503	304	788	112	20	231