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

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most loss by a nba coach career
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most regular-season loss by a NBA coach career
WilkensFitchNelsonMottaBrownShueKarlSloanRamsayFitzsimmonsAdelmanDunleavyRiversCarlisleRileyPopovichLougheryMacLeodScottHolzmanMcMillanGentrySaundersFratelloMoe1.2k1.1k1.1k1.0k904861824803783775749716713701694666662657647604597595592548529
COACHGPLMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF
Lenny Wilkens24871,155241.5102.844.424.039.83.120.727.675.2600,505255,733110,45759,68755,022
Bill Fitch20501,106241.3104.945.023.941.92.319.726.674.1494,750214,96092,15848,91649,383
Don Nelson23981,063241.7108.241.84.220.927.476.3579,595259,57457,689
Dick Motta19521,017241.7106.541.62.721.728.875.4471,705207,82445,399
Larry Brown2002904241.699.938.12.921.228.673.9483,755200,02946,943
Gene Shue1645861241.5107.442.91.121.128.474.3397,300176,74339,513
George Karl1999824241.6104.842.123.79.15.014.839.383.347.15.414.936.020.927.775.6483,035209,43184,10547,42218,1899,95229,66346,119
Jerry Sloan2024803241.6101.341.825.28.25.337.979.048.03.19.034.822.429.476.3488,910205,07784,58151,04616,67210,71448,925
Jack Ramsay1647783241.3110.543.90.72.726.622.529.975.0397,380181,98441,578
Cotton Fitzsimmons1607775241.5110.743.51.223.030.575.6388,155177,88840,547
Rick Adelman1791749242.0104.044.023.68.44.614.539.085.445.75.816.435.220.226.676.1433,440186,18478,84942,23815,0578,28225,96237,464
Mike Dunleavy1329716241.697.241.422.47.85.114.836.780.245.74.112.233.719.726.175.7321,085129,17154,97529,70810,4296,76219,68729,010
Doc Rivers1715713241.7102.742.022.68.04.914.138.081.746.57.620.636.719.225.575.4414,575176,18472,05638,69413,7148,42324,17838,025
Rick Carlisle1546701241.9100.642.022.07.44.813.037.182.045.28.724.535.717.722.877.6373,915155,52764,90633,96611,4367,49220,15931,398
Pat Riley1904694241.5102.543.024.839.682.448.03.919.526.174.7459,910195,14981,88847,31444,062
Gregg Popovich1980666241.6100.343.022.67.35.613.337.881.046.77.118.937.317.623.575.0478,400198,53485,04944,67614,47311,08926,24138,043
Kevin Loughery1136662241.8104.440.51.722.129.176.0274,715118,55728,967
John MacLeod1364657241.4107.944.126.542.888.648.31.13.928.021.628.376.2329,235147,19960,10836,19333,145
Byron Scott1101647241.595.041.520.77.54.313.335.681.443.75.816.934.418.124.075.6265,865104,64945,73722,7738,2684,74314,67723,132
Red Holzman1300604241.2104.941.90.621.028.374.1313,520136,41332,473
Nate McMillan1269597241.799.040.921.57.54.613.037.381.545.77.219.636.717.222.476.7306,685125,63151,87727,3369,5395,84116,45526,341
Alvin Gentry1105595242.0103.342.922.87.25.214.238.783.946.27.621.236.018.224.275.0267,375114,14547,39825,1778,0005,69415,71022,945
Flip Saunders1246592241.797.141.823.17.35.613.337.282.045.44.512.935.118.123.676.6301,190120,99652,11028,7979,1296,93516,55926,841
Mike Fratello1215548241.799.641.122.78.45.314.837.680.546.73.39.435.621.027.875.7293,725120,98149,88027,61310,2356,42518,02428,395
Doug Moe1157529241.6118.544.527.546.595.848.51.424.430.779.6279,530137,07851,44431,87029,137