LeBron James has the most turnovers in a single NBA playoff run with 94 turnovers in 2017-18.

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nba record for most turnovers by a player in a playoff run
2017-18James2005-06Wade1983-84Bird2005-06O'Neal1987-88Thomas2019-20James1992-93Johnson2018-19Green2013-14Westbrook1993-94Ewing1993-94Olajuwon1987-88Johnson2014-15Curry2014-15James2007-08Pierce2020-21Booker2011-12James1991-92Jordan1995-96Kemp2009-10Bryant2002-03Kidd1983-84Johnson2015-16Westbrook2010-11Westbrook2004-05Hamilton94908785858484838383838382828281818180797979787878
NAMESEASONTMGPTOVMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKPF+/-
LeBron JamesLeBron James2017-18CLECLE229441.934.09.19.01.41.04.312.523.253.91.85.234.27.29.774.6922748200198302352-22
Dwyane WadeDwyane Wade2005-06MIAMIA239041.728.45.95.72.21.13.99.519.249.70.61.637.88.810.980.8959654135132512671+134
Larry BirdLarry Bird1983-84BOSBOS238741.827.511.05.92.31.23.810.019.052.40.30.741.27.38.387.9961632252136542771
Shaquille O'NealShaquille O'Neal2005-06MIAMIA238533.018.49.81.70.51.53.77.712.761.20.00.03.07.937.475942422539113484+25
Isiah ThomasIsiah Thomas1987-88DETDET238539.621.94.78.72.90.33.78.018.243.70.61.929.55.46.682.891150410720166871
LeBron JamesLeBron James2019-20LALLAL218436.327.610.88.81.20.94.010.218.256.02.15.737.05.17.172.0762580226184261840+165
Kevin JohnsonKevin Johnson1992-93PHXPHX238439.717.82.77.91.50.63.76.213.048.00.00.10.05.46.879.591441062182351357
Draymond GreenDraymond Green2018-19GSWGSW228338.613.310.18.51.51.53.85.210.449.80.62.622.82.33.271.8850292223187323385+127
Russell WestbrookRussell Westbrook2013-14OKCOKC198338.726.77.38.12.20.34.48.820.942.01.55.328.07.68.688.473550713815341662+41
Patrick EwingPatrick Ewing1993-94NYKNYK258341.321.911.72.61.33.03.38.419.243.70.20.436.44.96.575.51,03254729365327694
Hakeem OlajuwonHakeem Olajuwon1993-94HOUHOU238343.028.911.04.31.74.03.611.622.351.90.10.250.05.67.079.598966425498409282
Magic JohnsonMagic Johnson1987-88LALLAL248340.219.95.412.61.40.23.57.013.751.40.30.650.05.56.585.296547713030334461
Stephen CurryStephen Curry2014-15GSWGSW218239.328.35.06.41.90.13.99.520.945.64.711.042.24.65.583.582659410513439347+163
LeBron JamesLeBron James2014-15CLECLE208242.230.111.38.51.71.14.111.427.241.71.35.522.76.18.473.1844601226169332158+79
Paul PiercePaul Pierce2007-08BOSBOS268238.119.75.04.61.10.33.26.314.244.11.74.636.15.56.880.299051112911928890+135
Devin BookerDevin Booker2020-21PHXPHX228140.427.35.64.50.80.23.79.621.544.72.06.232.16.06.790.588960112410018476+112
LeBron JamesLeBron James2011-12MIAMIA238142.730.39.75.61.90.73.510.921.850.01.03.725.97.510.273.9983697224129431647+199
Michael JordanMichael Jordan1991-92CHICHI228141.834.56.25.82.00.73.713.226.449.90.82.038.67.48.685.7920759137127441662
Shawn KempShawn Kemp1995-96SEASEA208036.020.910.41.51.22.04.07.412.957.00.00.20.06.27.879.572041820830244084
Kobe BryantKobe Bryant2009-10LALLAL237940.129.26.05.51.30.73.410.222.245.82.15.737.46.78.084.2923671138126311675+96
Jason KiddJason Kidd2002-03NJNNJN207942.620.17.78.21.80.24.06.917.140.21.75.232.74.75.782.585240215416336446+79
Magic JohnsonMagic Johnson1983-84LALLAL217939.918.26.613.52.01.03.87.213.055.10.00.30.03.84.880.0837382139284422071
Russell WestbrookRussell Westbrook2015-16OKCOKC187837.426.06.911.02.60.14.38.821.840.51.95.832.46.47.882.967446812419846243+119
Russell WestbrookRussell Westbrook2010-11OKCOKC177837.523.85.46.41.40.44.67.920.239.40.82.829.27.18.485.26384059110824656+27
Richard HamiltonRichard Hamilton2004-05DETDET257843.220.04.34.30.80.13.17.917.545.30.41.429.43.84.879.81,07950110810721379+114
StatMuse has season-level data for turnovers going back to the 1978 playoffs.