Ron Harper has the most turnovers by a rookie with 345 turnovers in 1986-87.

which rookie has the most turnovers 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	+/-
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	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
Phil Ford	323	1978-79	KCK	79	34.5	15.9	2.3	8.6	2.2	0.1	4.1	5.9	12.7	46.5				4.1	5.1	81.3	2,723	1,260	182	681	174	6	245
Glenn Robinson	313	1994-95	MIL	80	37.0	21.9	6.4	2.5	1.4	0.3	3.9	8.0	17.6	45.1	1.1	3.4	32.1	5.0	6.2	79.6	2,958	1,755	513	197	115	22	234
Bernard King	311	1977-78	NJN	79	39.1	24.2	9.5	2.4	1.5	0.5	3.9	10.1	21.1	47.9				4.0	5.8	67.7	3,092	1,909	751	193	122	36	302
Trae Young	308	2018-19	ATL	81	30.9	19.1	3.7	8.1	0.9	0.2	3.8	6.5	15.5	41.8	1.9	6.0	32.4	4.2	5.1	82.9	2,503	1,549	301	653	72	15	140	-336
Shaquille O'Neal	307	1992-93	ORL	81	37.9	23.4	13.9	1.9	0.7	3.5	3.8	9.0	16.1	56.2	0.0	0.0	0.0	5.3	8.9	59.2	3,071	1,893	1,122	152	60	286	321
Steve Francis	306	1999-00	HOU	77	36.1	18.0	5.3	6.6	1.5	0.4	4.0	6.5	14.5	44.5	1.4	4.0	34.5	3.7	4.7	78.6	2,776	1,388	409	507	118	29	231	-158
Magic Johnson	305	1979-80	LAL	77	36.3	18.0	7.7	7.3	2.4	0.5	4.0	6.5	12.3	53.0	0.1	0.4	22.6	4.9	6.0	81.0	2,795	1,387	596	563	187	41	218
Reggie Theus	303	1978-79	CHI	82	33.6	16.3	2.8	5.2	1.1	0.2	3.7	6.5	13.6	48.0				3.2	4.2	76.1	2,753	1,338	228	429	93	18	270
Isiah Thomas	299	1981-82	DET	72	33.8	17.0	2.9	7.8	2.1	0.2	4.2	6.3	14.8	42.4	0.2	0.8	28.8	4.2	6.0	70.4	2,433	1,225	209	565	150	17	253
Ralph Sampson	294	1983-84	HOU	82	32.8	21.0	11.1	2.0	0.9	2.4	3.6	8.7	16.7	52.3	0.0	0.0	25.0	3.5	5.3	66.1	2,693	1,720	913	163	70	197	339
Anfernee Hardaway	292	1993-94	ORL	82	36.8	16.0	5.4	6.6	2.3	0.6	3.6	6.2	13.3	46.6	0.6	2.3	26.7	3.0	4.0	74.2	3,015	1,313	439	544	190	51	205
Michael Jordan	291	1984-85	CHI	82	38.3	28.2	6.5	5.9	2.4	0.8	3.5	10.2	19.8	51.5	0.1	0.6	17.3	7.7	9.1	84.5	3,144	2,313	534	481	196	69	285
Walter Davis	283	1977-78	PHX	81	32.0	24.2	6.0	3.4	1.4	0.2	3.5	9.7	18.4	52.6				4.8	5.8	83.0	2,590	1,959	484	273	113	20	242
Kelly Tripucka	280	1981-82	DET	82	37.5	21.6	5.4	3.3	1.1	0.2	3.4	7.8	15.6	49.6	0.1	0.3	22.7	6.0	7.6	79.7	3,077	1,772	443	270	89	16	241
Tim Duncan	279	1997-98	SAS	82	39.1	21.1	11.9	2.7	0.7	2.5	3.4	8.6	15.7	54.9	0.0	0.1	0.0	3.9	5.9	66.2	3,204	1,731	977	224	55	206	254	+429
Karl Malone	279	1985-86	UTA	81	30.6	14.9	8.9	2.9	1.3	0.5	3.4	6.2	12.5	49.6	0.0	0.0	0.0	2.4	5.0	48.1	2,475	1,203	718	236	105	44	295
Ben Simmons	278	2017-18	PHI	81	33.7	15.8	8.1	8.2	1.7	0.9	3.4	6.7	12.3	54.5	0.0	0.1	0.0	2.4	4.2	56.0	2,732	1,279	659	661	140	70	211	+387
Christian Laettner	275	1992-93	MIN	81	34.9	18.2	8.7	2.8	1.3	1.0	3.4	6.2	13.1	47.4	0.0	0.5	10.0	5.7	6.8	83.5	2,823	1,472	708	223	105	83	290
Russell Westbrook	274	2008-09	OKC	82	32.5	15.3	4.9	5.3	1.3	0.2	3.3	5.3	13.4	39.8	0.4	1.6	27.1	4.3	5.2	81.5	2,668	1,256	399	435	110	16	191	-272
LeBron James	273	2003-04	CLE	79	39.5	20.9	5.5	5.9	1.6	0.7	3.5	7.9	18.9	41.7	0.8	2.7	29.0	4.4	5.8	75.4	3,122	1,654	432	465	130	58	149	-144
Jamaal Tinsley	270	2001-02	IND	80	30.5	9.4	3.7	8.1	1.7	0.5	3.4	3.6	9.5	38.0	0.5	2.2	24.0	1.6	2.3	70.4	2,442	751	298	647	138	40	248	+43
Mitch Richmond	269	1988-89	GSW	79	34.4	22.0	5.9	4.2	1.0	0.2	3.4	8.2	17.5	46.8	0.4	1.1	36.7	5.2	6.4	81.0	2,717	1,741	468	334	82	13	223
DeMarcus Cousins	268	2010-11	SAC	81	28.5	14.1	8.6	2.5	1.0	0.8	3.3	5.3	12.4	43.0	0.0	0.2	16.7	3.4	5.0	68.7	2,309	1,143	699	204	85	68	332	-261