Lenny Wilkens has lost the most games by a coach, with 1,155 losses.

Interpreted as:

most regular-season loses by a NBA coach career

	COACH	L	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	AST	STL	BLK	TOV	PF
1	Lenny Wilkens	1,155	2,487	241.5	102.8	44.4	24.0			39.8			3.1			20.7	27.6	75.2					600,505	255,733	110,457	59,687				55,022
2	Bill Fitch	1,106	2,050	241.3	104.9	45.0	23.9			41.9			2.3			19.7	26.6	74.1					494,750	214,960	92,158	48,916				49,383
3	Don Nelson	1,063	2,398	241.7	108.2					41.8			4.2			20.9	27.4	76.3					579,595	259,574						57,689
4	Dick Motta	1,017	1,952	241.7	106.5					41.6			2.7			21.7	28.8	75.4					471,705	207,824						45,399
5	Larry Brown	904	2,002	241.6	99.9					38.1			2.9			21.2	28.6	73.9					483,755	200,029						46,943
6	Rick Carlisle	878	1,877	241.8	103.5	42.0	23.0	7.5	5.0	38.2	83.5	45.7	9.5	26.5	35.8	17.7	22.7	77.7	55.4	10.1	31.9	13.7	453,805	194,337	78,824	43,243	14,003	9,352	25,638	38,219
7	Gene Shue	861	1,645	241.5	107.4					42.9			1.1			21.1	28.4	74.3					397,300	176,743						39,513
8	Gregg Popovich	851	2,263	241.6	101.9	43.1	23.3	7.3	5.6	38.4	82.3	46.6	7.7	20.9	36.8	17.4	23.2	75.2	55.1	10.5	32.7	13.9	546,795	230,554	97,646	52,733	16,540	12,596	31,387	43,174
9	Doc Rivers	832	2,005	241.7	104.3	42.0	23.0	7.9	4.9	38.4	82.2	46.7	8.4	22.7	37.0	19.1	25.2	75.9	55.9	10.0	32.1	14.5	484,675	209,220	84,296	46,040	15,903	9,801	29,117	43,633
10	George Karl	824	1,999	241.6	104.8	42.1	23.7	9.1	5.0	39.3	83.3	47.1	5.4	14.9	36.0	20.9	27.7	75.6	54.9	12.2	29.9	15.2	483,035	209,431	84,105	47,422	18,189	9,952	30,385	46,119
11	Jerry Sloan	803	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	55.1				488,910	205,077	84,581	51,046	16,672	10,714		48,925
12	Jack Ramsay	783	1,647	241.3	110.5					43.9			0.7	2.7	26.6	22.5	29.9	75.0					397,380	181,984						41,578
13	Cotton Fitzsimmons	775	1,607	241.5	110.7					43.5			1.2			23.0	30.5	75.6					388,155	177,888						40,547
14	Rick Adelman	749	1,791	242.0	104.0	44.0	23.6	8.4	4.6	39.0	85.4	45.7	5.8	16.4	35.2	20.2	26.6	76.1	53.5	13.0	31.0	14.9	433,440	186,184	78,849	42,238	15,057	8,282	26,719	37,464
15	Mike Dunleavy	716	1,329	241.6	97.2	41.4	22.4	7.8	5.1	36.7	80.2	45.7	4.1	12.2	33.7	19.7	26.1	75.7	53.0	12.2	29.2	15.4	321,085	129,171	54,975	29,708	10,429	6,762	20,413	29,010
16	Pat Riley	694	1,904	241.5	102.5	43.0	24.8			39.6	82.4	48.0	3.9			19.5	26.1	74.7	54.6				459,910	195,149	81,888	47,314				44,062
17	Nate McMillan	668	1,428	241.6	100.8	41.2	21.9	7.5	4.6	37.9	82.4	46.0	7.7	21.1	36.7	17.3	22.4	77.3	54.6	10.9	30.3	13.5	345,070	143,954	58,877	31,238	10,665	6,575	19,250	29,367
18	Kevin Loughery	662	1,136	241.8	104.4					40.5			1.7			22.1	29.1	76.0					274,715	118,557						28,967
19	John MacLeod	657	1,364	241.4	107.9	44.1	26.5			42.8	88.6	48.3	1.1	3.9	28.0	21.6	28.3	76.2	53.4				329,235	147,199	60,108	36,193				33,145
20	Byron Scott	647	1,101	241.5	95.0	41.5	20.7	7.5	4.3	35.6	81.4	43.7	5.8	16.9	34.4	18.1	24.0	75.6	51.7	11.5	30.0	14.0	265,865	104,649	45,737	22,773	8,268	4,743	15,396	23,132
21	Alvin Gentry	636	1,170	242.0	103.7	42.9	22.9	7.2	5.1	38.8	84.1	46.2	7.8	21.9	35.8	18.2	24.2	75.1	54.7	10.9	32.0	14.8	283,100	121,336	50,164	26,739	8,466	5,978	17,271	24,167
22	Red Holzman	604	1,300	241.2	104.9					41.9			0.6			21.0	28.3	74.1					313,520	136,413						32,473
23	Flip Saunders	592	1,246	241.7	97.1	41.8	23.1	7.3	5.6	37.2	82.0	45.4	4.5	12.9	35.1	18.1	23.6	76.6	52.6	12.1	29.8	13.8	301,190	120,996	52,110	28,797	9,129	6,935	17,174	26,841
24	Erik Spoelstra	583	1,384	242.0	104.3	42.0	22.9	7.8	4.8	38.5	82.5	46.7	9.8	27.0	36.2	17.5	22.8	76.6	56.4	9.5	32.5	14.0	334,910	144,339	58,128	31,692	10,737	6,597	19,365	26,913
25	Dwane Casey	570	1,064	242.1	103.1	42.3	21.8	7.3	4.8	37.8	83.7	45.2	9.1	26.0	35.2	18.3	23.6	77.5	54.8	10.5	31.8	14.1	257,585	109,647	45,042	23,218	7,774	5,118	14,999	23,000