LeBron James and Shaquille O'Neal are tied for the most double-doubles with 40+ points in a single NBA playoff run, with 5 double-doubles.

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who has most 40 point double doubles in one playoff
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Who has most 40 or more point double doubles in one playoff?
2017-18James1999-00O'Neal2020-21Antetokounmpo1988-89Jordan2000-01O'Neal1992-93Barkley2020-21Booker2020-21Doncic2020-21Lillard2017-18Westbrook2016-17James2016-17Westbrook2015-16James2014-15James2011-12James2008-09James2004-05Stoudemire2002-03Nowitzki2001-02O'Neal2000-01Bryant1994-95Olajuwon1989-90Ewing1989-90Jordan1987-88Olajuwon1984-85Bird5544332222222222222222222
NAMESEASONTMGPDD2PTSMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINREBASTSTLBLKTOVPF+/-
LeBron JamesLeBron James2017-18CLECLE8536142.545.19.08.31.80.54.316.927.960.52.55.545.58.912.074.034072661443419+29
Shaquille O'NealShaquille O'Neal1999-00LALLAL5521146.042.216.63.40.44.01.217.227.861.90.00.07.817.843.82308317220616+76
Giannis AntetokounmpoGiannis Antetokounmpo2020-21MILMIL4417342.643.313.04.30.52.33.315.023.563.81.04.025.012.317.072.11705217291311+39
Michael JordanMichael Jordan1988-89CHICHI7431142.444.48.17.13.01.13.615.026.456.80.61.733.313.916.782.929757502182524
Shaquille O'NealShaquille O'Neal2000-01LALLAL3313147.743.720.33.70.73.33.717.328.760.50.00.09.018.050.01436111210118-1
Charles BarkleyCharles Barkley1992-93PHXPHX3312946.343.017.35.01.31.32.014.722.764.70.30.750.013.315.088.913952154468
Devin BookerDevin Booker2020-21PHXPHX4216942.542.37.34.80.50.82.816.028.057.13.36.054.27.07.593.31702919231115+28
Luka DoncicLuka Doncic2020-21DALDAL3213242.044.08.012.30.70.05.016.331.751.66.012.050.05.39.059.3126243720157+9
Damian LillardDamian Lillard2020-21PORPOR229747.148.55.010.00.52.02.014.024.058.310.516.563.610.011.587.09410201441-14
Russell WestbrookRussell Westbrook2017-18OKCOKC229143.945.512.56.01.00.05.017.541.042.76.014.042.94.56.075.088251220106+9
LeBron JamesLeBron James2016-17CLECLE228245.741.013.010.01.51.52.516.528.557.94.08.547.14.09.044.491262033570
Russell WestbrookRussell Westbrook2016-17OKCOKC229841.649.010.511.02.00.55.516.038.541.63.514.524.113.517.577.183212241118+23
LeBron JamesLeBron James2015-16CLECLE228242.641.012.09.03.53.01.516.028.556.13.57.050.05.58.068.88524187634+39
LeBron JamesLeBron James2014-15CLECLE3212445.541.311.38.31.70.73.315.735.344.32.37.331.87.710.374.2137342552108-7
LeBron JamesLeBron James2011-12MIAMIA228544.442.516.57.01.01.04.516.526.562.31.02.050.08.512.568.08933142294+26
LeBron JamesLeBron James2008-09CLECLE4218144.045.39.38.01.51.53.314.828.052.73.38.538.212.517.073.51763732661311+27
Amar'e StoudemireAmar'e Stoudemire2004-05PHXPHX3212340.041.013.71.00.72.32.314.024.756.80.00.30.013.015.384.812041327710+6
Dirk NowitzkiDirk Nowitzki2002-03DALDAL228847.044.010.02.51.51.02.015.523.566.04.55.581.88.510.085.0942053246+24
Shaquille O'NealShaquille O'Neal2001-02LALLAL228142.540.514.54.50.01.55.014.024.058.30.00.012.515.580.68529903106+43
Kobe BryantKobe Bryant2000-01LALLAL229347.546.513.03.01.51.03.017.032.053.11.01.566.711.513.585.2952663266+23
Hakeem OlajuwonHakeem Olajuwon1994-95HOUHOU5221142.642.210.45.01.23.22.618.029.062.10.20.2100.06.08.471.421352256161324
Patrick EwingPatrick Ewing1989-90NYKNYK228942.544.513.05.53.52.52.016.024.066.70.00.012.513.592.68526117547
Michael JordanMichael Jordan1989-90CHICHI6227643.246.07.06.82.51.33.817.232.353.11.54.037.510.211.885.925942411582322
Hakeem OlajuwonHakeem Olajuwon1987-88HOUHOU228143.540.520.52.52.52.52.015.525.560.80.00.50.09.511.086.4874155547
Larry BirdLarry Bird1984-85BOSBOS3212542.041.710.04.71.00.73.015.028.053.60.31.325.011.312.094.412630143298
StatMuse has game-level data for double-doubles going back to the 1983 playoffs.