Brett Favre has the most career fumbles by a quarterback, with 166 fumbles.

which quarterback has the most fumbles
FavreMoonKriegCollinsElwayManningBradyBledsoeEsiasonTestaverdeRiversBreesKitnaMarinoFoutsCunninghamGabrielRoethlisbergerCulpepperWarnerMcNairVickChandler166161153139137125125123123117111111110110106105105104102102999898
NAMEGPFUMLOSTCMPATTPCTYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Brett FavreBrett Favre3021666,30010,16962.071,8387.1237.95085.03363.35253,48786.0
Warren MoonWarren Moon2081613,9886,82358.449,3257.2237.12914.32333.44583,41580.9
Dave KriegDave Krieg2131533,1055,31158.538,1477.2179.12614.91993.74943,79481.5
Kerry CollinsKerry Collins1981393,4876,26155.740,9226.5206.72083.31963.13372,23073.8
John ElwayJohn Elway2341374,1237,25056.951,4757.1220.03004.12263.15163,78579.9
Eli ManningEli Manning236125564,8958,11960.357,0237.0241.63664.52443.04112,87084.1
Tom BradyTom Brady3011256,77810,59864.079,2047.5263.15815.51911.85213,27297.3
Drew BledsoeDrew Bledsoe1941233,8396,71757.244,6116.6230.02513.72063.14673,13577.1
Boomer EsiasonBoomer Esiason1871232,9695,20557.037,9207.3202.82474.71843.53182,43881.1
Vinny TestaverdeVinny Testaverde2331173,7876,70156.546,2336.9198.42754.12674.04172,99275.0
Philip RiversPhilip Rivers244111485,2778,13464.963,4407.8260.04215.22092.64652,84295.2
Drew BreesDrew Brees2871117,14210,55167.780,3587.6280.05715.42432.34202,99198.7
Jon KitnaJon Kitna1411102,6774,44260.329,7456.7211.01693.81653.73231,98777.4
Dan MarinoDan Marino2421104,9678,35859.461,3617.3253.64205.02523.02701,93086.4
Dan FoutsDan Fouts1811063,2975,60458.843,0407.7237.82544.52424.33192,30480.2
Randall CunninghamRandall Cunningham1611052,4294,28956.629,9797.0186.22074.81343.14843,53781.5
Roman GabrielRoman Gabriel1831052,3664,49852.629,4446.5160.92014.51493.31681,26874.3
Ben RoethlisbergerBen Roethlisberger233104465,0507,83864.460,3487.7259.03965.12012.65163,43894.0
Daunte CulpepperDaunte Culpepper1051022,0163,19963.024,1537.6230.01494.71063.32981,69687.8
Kurt WarnerKurt Warner1241022,6664,07065.532,3447.9260.82085.11283.12601,66993.7
Steve McNairSteve McNair161992,7334,54460.131,3046.9194.41743.81192.62541,56782.8
Michael VickMichael Vick143981,8073,21756.222,4647.0157.11334.1882.73161,87980.4
Chris ChandlerChris Chandler180982,3284,00558.128,4847.1158.21704.21463.63802,59079.1
Jay CutlerJay Cutler15395383,0484,92062.035,1337.1229.62274.61603.33222,03585.3
Donovan McNabbDonovan McNabb167953,1705,37459.037,2766.9223.22344.41172.24102,62685.6
StatMuse has season-level data for fumbles going back to the 1945 season.

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