Russell Westbrook has the highest usage percentage with 40+ games played in a season, at 41.5 percent in 2016-17.

who has the highest usage in a season with at least 40 games played

NAME	GP	USG%	SEASON	TM	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
Russell Westbrook	81	41.5	2016-17	OKC	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	438	190	+251
James Harden	78	40.3	2018-19	HOU	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	387	244	+357
Kobe Bryant	80	38.7	2005-06	LAL	41.0	35.4	5.3	4.5	1.8	0.4	3.1	12.2	27.2	45.0	2.3	6.5	34.7	8.7	10.2	85.0	3,277	2,832	425	360	147	30	250	233	+320
Giannis Antetokounmpo	63	38.4	2022-23	MIL	32.1	31.1	11.8	5.7	0.8	0.8	3.9	11.2	20.3	55.3	0.7	2.7	27.5	7.9	12.3	64.5	2,024	1,959	742	359	52	51	246	197	+341
Russell Westbrook	67	38.2	2014-15	OKC	34.4	28.1	7.3	8.6	2.1	0.2	4.4	9.4	22.0	42.6	1.3	4.3	29.9	8.1	9.8	83.5	2,302	1,886	488	574	140	14	293	184	+247
Michael Jordan	82	38.2	1986-87	CHI	40.0	37.1	5.2	4.6	2.9	1.5	3.3	13.4	27.8	48.2	0.1	0.8	18.2	10.2	11.9	85.7	3,281	3,041	430	377	236	125	272	237
Allen Iverson	60	37.7	2001-02	PHI	43.7	31.4	4.5	5.5	2.8	0.2	4.0	11.1	27.8	39.8	1.3	4.5	29.1	7.9	9.8	81.2	2,622	1,883	269	331	168	13	237	102	+278
Luka Doncic	66	37.5	2022-23	DAL	36.2	32.4	8.6	8.0	1.4	0.5	3.6	10.9	22.0	49.6	2.8	8.2	34.2	7.8	10.5	74.2	2,391	2,138	569	529	90	33	236	166	+128
Giannis Antetokounmpo	63	37.3	2019-20	MIL	30.4	29.5	13.6	5.6	1.0	1.0	3.7	10.9	19.7	55.3	1.4	4.7	30.4	6.3	10.0	63.3	1,917	1,857	856	354	61	66	230	195	+682
Luka Doncic	65	37.3	2021-22	DAL	35.4	28.4	9.1	8.7	1.2	0.6	4.5	9.9	21.6	45.7	3.1	8.8	35.3	5.6	7.5	74.4	2,301	1,847	593	568	75	36	292	145	+146
Joel Embiid	68	36.9	2021-22	PHI	33.8	30.6	11.7	4.2	1.1	1.5	3.1	9.8	19.6	49.9	1.4	3.7	37.1	9.6	11.8	81.4	2,297	2,079	796	284	77	99	214	181	+367
Joel Embiid	66	36.8	2022-23	PHI	34.6	33.1	10.2	4.2	1.0	1.7	3.4	11.0	20.1	54.8	1.0	3.0	33.0	10.0	11.7	85.7	2,284	2,183	670	274	66	112	226	205	+424
Luka Doncic	61	36.6	2019-20	DAL	33.6	28.8	9.4	8.8	1.0	0.2	4.3	9.5	20.6	46.3	2.8	8.9	31.6	7.0	9.2	75.8	2,047	1,759	573	538	62	14	260	153	+253
DeMarcus Cousins	72	36.3	2016-17	TOT	34.2	27.0	11.0	4.6	1.4	1.3	3.7	9.0	19.9	45.2	1.8	5.0	36.1	7.2	9.3	77.2	2,465	1,942	794	332	100	93	269	278	-25
Jermaine O'Neal	44	36.1	2004-05	IND	34.8	24.3	8.8	1.9	0.6	2.0	3.0	8.8	19.4	45.2	0.0	0.1	16.7	6.7	8.9	75.4	1,530	1,068	388	82	25	88	131	173	+32
Dwyane Wade	79	36.1	2008-09	MIA	38.6	30.2	5.0	7.5	2.2	1.3	3.4	10.8	22.0	49.1	1.1	3.5	31.7	7.5	9.8	76.5	3,048	2,386	398	589	173	106	272	178	+216
James Harden	68	36.0	2019-20	HOU	36.5	34.3	6.6	7.5	1.8	0.9	4.5	9.9	22.3	44.4	4.4	12.4	35.5	10.2	11.8	86.5	2,483	2,335	446	512	125	60	308	227	+284
Michael Jordan	60	36.0	2001-02	WAS	34.9	22.9	5.7	5.2	1.4	0.4	2.7	9.2	22.1	41.6	0.2	0.9	18.9	4.4	5.6	79.0	2,093	1,375	339	310	85	26	162	119	+16
James Harden	72	35.9	2017-18	HOU	35.4	30.4	5.4	8.8	1.8	0.7	4.4	9.0	20.1	44.9	3.7	10.0	36.7	8.7	10.1	85.8	2,551	2,191	389	630	126	50	315	169	+527
Luka Doncic	70	35.9	2023-24	DAL	37.5	33.9	9.2	9.8	1.4	0.5	4.0	11.5	23.6	48.7	4.1	10.6	38.2	6.8	8.7	78.6	2,624	2,370	647	686	99	38	282	149	+319
Luka Doncic	66	35.9	2020-21	DAL	34.3	27.7	8.0	8.6	1.0	0.5	4.3	9.8	20.5	47.9	2.9	8.3	35.0	5.2	7.1	73.0	2,262	1,830	527	567	64	36	281	152	+164
Allen Iverson	71	35.9	2000-01	PHI	42.0	31.1	3.8	4.6	2.5	0.3	3.3	10.7	25.5	42.0	1.4	4.3	32.0	8.2	10.1	81.4	2,979	2,207	273	325	178	20	237	147	+368
Allen Iverson	72	35.7	2005-06	PHI	43.1	33.0	3.2	7.4	1.9	0.1	3.4	11.3	25.3	44.7	1.0	3.1	32.3	9.4	11.5	81.4	3,103	2,377	232	532	140	10	248	121	-3
Kobe Bryant	58	35.6	2011-12	LAL	38.5	27.9	5.4	4.6	1.2	0.3	3.5	9.9	23.0	43.0	1.5	4.9	30.3	6.6	7.8	84.5	2,232	1,616	313	264	69	18	204	105	+137
Trevor Ruffin	49	35.5	1994-95	PHX	6.5	4.8	0.5	1.0	0.3	0.0	1.0	1.7	4.0	42.6	0.8	2.0	38.4	0.6	0.8	71.1	319	233	23	48	14	2	47	52