Joe Mazzulla has the best winning percentage by a coach, winning 73.8 percent of the time.

nba coach with highest winning percentage

COACH	W%	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF
Joe Mazzulla	.738	164	242.7	119.3	45.8	26.8	6.6	5.9	12.0	43.1	89.5	48.1	16.3	42.5	38.2	16.9	20.9	80.9	39,810	19,558	7,516	4,393	1,078	968	1,967	2,868
Phil Jackson	.704	1,640	241.8	103.1	43.7	24.1	8.4	5.0	13.6	39.5	83.7	47.2	5.1	14.4	35.6	19.0	25.7	73.7	396,550	169,073	71,619	39,569	13,721	8,254	22,328	35,442
Billy Cunningham	.698	650	242.0	111.2	45.6					43.3			0.4			24.2	31.7	76.2	157,325	72,272	29,652					16,236
Adrian Griffin	.698	43	241.7	124.6	44.4	26.7	6.5	5.6	12.6	44.8	89.8	49.9	14.2	37.6	37.7	20.8	26.7	77.9	10,395	5,356	1,911	1,148	279	240	540	870
Larry Bird	.687	214	241.4	97.7	40.7	22.2	7.1	4.7	13.2	36.0	78.2	46.0	6.0	15.5	38.6	19.8	25.1	78.9	51,660	20,913	8,702	4,751	1,520	1,013	2,829	4,727
David Blatt	.675	123	241.6	102.6	43.6	22.1	7.2	4.0	13.5	37.6	82.4	45.6	10.1	27.7	36.4	17.3	23.2	74.4	29,720	12,614	5,366	2,718	882	493	1,665	2,344
K.C. Jones	.674	774	241.9	109.0						43.5			1.9	5.4	34.5	20.7	26.7	77.6	187,210	84,349						17,404
Bill Bertka	.667	3	240.0	111.3	40.0	28.0	8.3	4.0	13.3	44.0	84.0	52.4	6.0	12.7	47.4	17.3	24.0	72.2	720	334	120	84	25	12	40	69
Bob Pettit	.667	6	240.0	122.5	54.3					47.3	104.2	45.4				27.8	37.8	73.6	1,440	735	326					167
John Logan	.667	3	240.0	86.7						30.0						26.7	36.7	72.7	720	260						92
Dick Fitzgerald	.667	3	240.0	68.7						27.0						14.7	24.0	61.1	720	206						65
Red Auerbach	.661	1,419	241.6	103.0						38.9						25.2			342,835	146,160
Steve Kerr	.654	793	241.3	114.1	44.8	28.6	8.2	5.5	14.5	42.2	88.1	47.9	13.2	34.5	38.1	16.5	21.0	78.6	191,345	90,505	35,553	22,652	6,517	4,399	11,483	16,186
Ed Macauley	.650	137	241.5	111.8						41.6						28.6	38.3	74.7	33,080	15,315
Pat Riley	.636	1,904	241.5	102.5	43.0	24.8				39.6	82.4	48.0	3.9			19.5	26.1	74.7	459,910	195,149	81,888	47,314				44,062
Harold Olsen	.633	158	241.6	78.7						30.4						17.8			38,170	12,429
Gregg Popovich	.628	2,209	241.6	101.6	43.1	23.2	7.3	5.5	13.3	38.3	82.1	46.7	7.6	20.5	36.9	17.4	23.2	75.1	533,785	224,450	95,232	51,174	16,105	12,249	29,434	42,288
Slater Martin	.625	8	249.4	101.5						38.8						24.0	31.3	76.8	1,995	812						198
Les Harrison	.620	476	243.7	84.9						29.9						25.1	34.3	72.9	116,015	40,409
Tom Heinsohn	.619	690	241.1	110.6						44.5						21.5	27.7	77.8	166,375	76,314						16,982
Neil Johnston	.617	154	241.0	119.8						47.5	114.0	41.7				24.8	37.6	65.9	37,110	18,453						3,663
Frank McGuire	.613	80	243.1	125.4						49.0						27.5	40.1	68.7	19,450	10,035						2,004
Mike Brown	.607	727	242.1	103.0	43.5	22.4	7.1	4.6	13.2	38.1	82.4	46.2	8.4	23.1	36.2	18.4	24.9	73.8	176,005	74,853	31,615	16,288	5,136	3,329	9,619	14,584
Mike Budenholzer	.604	801	241.3	110.0	45.3	25.1	7.9	4.9	14.1	40.5	87.0	46.6	11.9	32.9	36.3	17.0	22.2	76.4	193,265	88,115	36,262	20,070	6,351	3,915	11,263	14,959
Jerry Sloan	.603	2,024	241.6	101.3	41.8	25.2	8.2	5.3		37.9	79.0	48.0	3.1	9.0	34.8	22.4	29.4	76.3	488,910	205,077	84,581	51,046	16,672	10,714		48,925