Wilt Chamberlain has averaged the most career rebounds per game, with 22.9 per game.

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who leads the nba in all-time rebounds per game
Interpreted as:
Who leads the NBA in all-time rebounds per game with a minimum of 400 games played?
ChamberlainRussellPettitLucasThurmondUnseldBellamyCowensBaylorDrummondRodmanReedJohnsonHayesMaloneSchayesBridgesHowardGallatinBarkleyGobertTownsJohnstonDukesAbdul-Jabbar22.922.516.215.615.014.013.713.613.513.513.112.912.712.512.212.111.911.911.911.711.511.411.311.311.2
NAMEGPRPGMPGPPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Wilt ChamberlainWilt Chamberlain104522.945.830.14.412.122.554.05.811.451.147,85931,41923,9244,6432,075
Bill RussellBill Russell96322.542.315.14.35.913.444.03.35.856.140,72614,52221,6204,1002,592
Bob PettitBob Pettit79216.238.826.43.09.321.343.67.810.376.130,69020,88012,8492,3692,529
Jerry LucasJerry Lucas82915.638.817.03.30.40.36.913.849.93.24.178.332,13114,05312,9422,73028242,389
Nate ThurmondNate Thurmond96415.037.215.02.70.52.15.713.642.13.55.366.735,88114,43714,4642,5751255532,624
Wes UnseldWes Unseld98414.036.410.83.91.10.61.94.48.750.90.00.050.01.93.063.335,83210,62413,7693,8226283675792,762
Walt BellamyWalt Bellamy104313.737.320.12.40.70.67.614.751.64.97.863.238,94020,94114,2412,54452483,536
Dave CowensDave Cowens76613.638.617.63.81.10.92.27.516.346.00.00.17.12.63.478.329,56513,51610,4442,9105994885432,920
Elgin BaylorElgin Baylor84613.540.027.44.310.323.843.16.88.778.033,86323,14911,4633,6502,596
Andre DrummondAndre Drummond67413.530.314.11.41.41.52.06.011.153.70.00.213.42.24.747.220,4019,5339,1109289281,0181,3452,128-690
Dennis RodmanDennis Rodman91113.131.77.31.80.70.61.63.05.852.10.10.423.11.22.058.428,8396,68311,9541,6006115311,4842,843+827
Willis ReedWillis Reed65012.935.518.71.80.61.17.515.747.63.85.174.723,07312,1838,4141,18612212,411
Gus JohnsonGus Johnson58112.734.717.12.77.116.144.02.94.269.920,1409,9447,3791,5412,037
Elvin HayesElvin Hayes130312.538.421.01.81.02.02.48.418.645.20.00.114.74.16.167.050,00027,31316,2792,3988641,7711,3584,193
Moses MaloneMoses Malone132912.233.920.61.40.81.33.17.114.549.10.00.110.06.48.376.945,07127,40916,2121,7961,0891,7333,8043,076
Dolph SchayesDolph Schayes93212.134.418.63.05.915.638.06.88.085.429,80017,36611,2562,8133,207
Bill BridgesBill Bridges92611.933.311.92.80.70.44.510.244.22.94.169.330,87811,01211,0542,55369363,375
Dwight HowardDwight Howard120711.932.215.91.40.91.82.75.89.858.70.00.120.84.47.856.638,86419,23714,4051,6531,0682,2093,2783,842+3025
Harry GallatinHarry Gallatin56211.931.913.51.94.310.540.45.06.577.815,8137,6066,6841,0891,744
Charles BarkleyCharles Barkley107311.736.722.13.91.50.83.17.914.554.10.51.926.65.98.173.539,33023,75712,5464,2151,6488883,3763,287+532
Rudy GobertRudy Gobert57411.529.812.21.30.72.21.64.56.965.00.00.00.03.25.063.217,1017,0046,5807653891,2869411,478+2552
Karl-Anthony TownsKarl-Anthony Towns43611.434.323.03.00.81.42.78.616.352.61.64.039.74.35.283.414,95910,0364,9911,3113476121,1601,469+344
Neil JohnstonNeil Johnston51611.335.519.42.56.414.444.46.68.676.818,29810,0235,8561,2691,681
Walter DukesWalter Dukes55311.326.510.41.13.59.436.93.55.070.014,6715,7656,2236082,260
Kareem Abdul-JabbarKareem Abdul-Jabbar156011.236.824.63.60.92.62.710.218.155.90.00.05.64.36.072.157,44638,38717,4405,6601,1603,1892,5274,657
StatMuse has season-level data for rebounds per game going back to the 1950-51 season.