The Golden State Warriors have the best record by a team in a season, with a record of 73-9 in 2015-16.

which team had the best regular season record in a season
2015-16Warriors1995-96Bulls1996-97Bulls1971-72Lakers1966-6776ers1972-73Celtics2016-17Warriors2015-16Spurs2014-15Warriors2006-07Mavericks1999-00Lakers1991-92Bulls1985-86Celtics1946-47Capitols2012-13Heat2008-09Cavaliers2007-08Celtics1970-71Bucks1949-50Nationals2017-18Rockets2008-09Lakers1986-87Lakers1982-8376ers1959-60Celtics2005-06Pistons1996-97Jazz1995-96SuperSonics1964-65Celtics2005-06Spurs1993-94SuperSonics73-972-1069-1369-1368-1368-1467-1567-1567-1567-1567-1567-1567-1549-1166-1666-1666-1666-1651-1365-1765-1765-1765-1759-1664-1864-1864-1862-1863-1963-19
TEAMSEASONGPRECW%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF
Golden State WarriorsGolden State Warriors2015-168273-9.890242.4114.946.228.98.46.115.242.587.348.713.131.641.616.721.876.319,8809,4213,7882,3736894981,2451,701
Chicago BullsChicago Bulls1995-968272-10.878240.6105.244.624.89.14.214.340.284.047.86.616.540.318.224.474.619,7308,6253,6582,0337453451,1751,807
Chicago BullsChicago Bulls1996-978269-13.841240.6103.145.126.18.74.013.540.084.447.36.417.137.316.822.574.719,7308,4583,6962,1427163321,1091,617
Los Angeles LakersLos Angeles Lakers1971-728269-13.841240.9121.056.427.247.897.549.025.434.573.419,7559,9204,6282,2321,636
Philadelphia 76ersPhiladelphia 76ers1966-678168-13.840240.9125.270.426.448.3100.048.328.642.168.019,51510,1435,7012,1381,906
Boston CelticsBoston Celtics1972-738268-14.829240.6112.758.628.346.5103.844.819.725.378.019,7309,2384,8022,3201,805
Golden State WarriorsGolden State Warriors2016-178267-15.817241.2115.944.430.49.66.814.843.187.149.512.031.238.317.822.678.819,7809,5033,6432,4917855551,2111,585
San Antonio SpursSan Antonio Spurs2015-168267-15.817240.3103.543.924.58.35.913.140.182.948.47.018.537.516.420.480.319,7058,4903,6012,0106774851,0711,433
Golden State WarriorsGolden State Warriors2014-158267-15.817240.6110.044.727.49.36.014.541.687.047.810.827.039.816.020.876.819,7309,0163,6672,2487624961,1851,628
Dallas MavericksDallas Mavericks2006-078267-15.817240.9100.041.919.96.85.013.936.778.646.76.517.138.120.124.980.519,7558,2013,4351,6325604081,1401,837
Los Angeles LakersLos Angeles Lakers1999-008267-15.817241.5100.847.023.47.56.513.938.383.445.94.212.832.920.128.969.619,8058,2673,8551,9216135341,1431,841
Chicago BullsChicago Bulls1991-928267-15.817241.8109.944.027.88.25.913.344.487.450.81.75.530.419.426.074.419,8309,0113,6122,2796724801,0881,693
Boston CelticsBoston Celtics1985-868267-15.817242.1114.146.429.17.86.216.645.389.250.81.74.835.121.827.479.419,8559,3593,8072,3876415111,3601,756
Washington CapitolsWashington Capitols1946-476049-11.817240.873.86.328.796.629.716.423.270.614,4504,4283781,144
Miami HeatMiami Heat2012-138266-16.805242.4102.938.623.08.75.413.938.477.449.68.722.139.617.423.075.419,8808,4363,1661,8907104411,1431,533
Cleveland CavaliersCleveland Cavaliers2008-098266-16.805241.2100.342.220.37.25.312.736.978.746.88.020.439.318.624.575.719,7808,2233,4601,6635934351,0451,663
Boston CelticsBoston Celtics2007-088266-16.805240.9100.542.022.48.54.615.236.476.747.57.319.138.120.526.577.119,7558,2453,4451,8336963791,2461,864
Milwaukee BucksMilwaukee Bucks1970-718266-16.805241.2118.453.027.448.495.250.921.529.074.219,7809,7104,3442,2491,847
Syracuse NationalsSyracuse Nationals1949-506451-13.797243.184.823.029.282.435.426.437.470.615,5605,4291,4731,833
Houston RocketsHouston Rockets2017-188265-17.793240.9112.443.521.58.54.813.838.784.246.015.342.336.219.625.178.119,7559,2133,5641,7676993921,1351,597
Los Angeles LakersLos Angeles Lakers2008-098265-17.793241.2106.943.923.38.85.113.540.385.147.46.718.536.119.625.577.019,7808,7683,6021,9087184201,1031,698
Los Angeles LakersLos Angeles Lakers1986-878265-17.793240.6117.844.429.68.95.916.645.688.451.62.05.536.724.531.178.919,7309,6563,6422,4287284821,3581,853
Philadelphia 76ersPhiladelphia 76ers1982-838265-17.793241.8112.147.924.69.97.019.843.988.049.90.31.322.924.032.374.219,8309,1913,9302,0168125771,6272,041
Boston CelticsBoston Celtics1959-607559-16.787241.0124.580.224.749.9119.641.724.733.673.418,0759,3376,0141,8491,856
Detroit PistonsDetroit Pistons2005-068264-18.780241.896.840.524.07.16.011.436.480.045.56.817.738.417.323.872.719,8307,9413,3221,9715804909311,513
Utah JazzUtah Jazz1996-978264-18.780241.8103.140.226.89.15.115.438.275.850.44.111.037.022.729.576.919,8308,4543,2992,1997484181,2591,981
Seattle SuperSonicsSeattle SuperSonics1995-968264-18.780242.4104.541.524.410.84.817.637.578.148.07.119.536.422.529.676.019,8808,5723,4031,9998823931,4411,967
Boston CelticsBoston Celtics1964-658062-18.775240.9112.871.922.244.6107.641.423.632.373.119,2759,0245,7481,7722,065
San Antonio SpursSan Antonio Spurs2005-068263-19.768241.595.641.520.96.65.713.736.577.347.26.416.638.516.223.170.219,8057,8373,3991,7175434671,1261,714
Seattle SuperSonicsSeattle SuperSonics1993-948263-19.768240.6105.941.225.812.84.515.440.784.248.43.08.833.521.629.074.519,7308,6873,3812,1121,0533651,2621,914