Geno Smith has made the most completions by a quarterback with 1 or fewer game played in a season, with 27 completions in 2015.

nfl which qb has the most completions in a season, maximum 1 game played
2015Smith2011McGee1991Marinovich2020Wolford2017Mahomes2012Lewis2008Sorgi1987McClure1987Zorn2017Sudfeld2019McCoy2011Delhomme2010Bouman2004Navarre2003O'Donnell2020Mariota2007Berlin1962Izo2010Bartel2004Martin1995Foley1994Salisbury1983Wilson2724232222222220201918181818181717171616161616
NAMESEASONTMGPCMPATTPCTYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Geno SmithGeno Smith2015NYJNYJ1274264.32656.3265.024.812.431987.9
Stephen McGeeStephen McGee2011DALDAL1243863.21824.8182.012.600.032583.4
Todd MarinovichTodd Marinovich1991RAIRAI1234057.52436.1243.037.500.000100.3
John WolfordJohn Wolford2020LARLAR1223857.92316.1231.000.012.62864.7
Patrick MahomesPatrick Mahomes2017KCKC1223562.92848.1284.000.012.921576.4
Thad LewisThad Lewis2012CLECLE1223268.82046.4204.013.113.131483.3
Jim SorgiJim Sorgi2008INDIND1223073.31785.9178.000.000.00087.9
Brian McClureBrian McClure1987BUFBUF1203852.61814.8181.000.037.921732.9
Jim ZornJim Zorn1987TBTB1203655.61995.5199.000.025.61648.3
Nate SudfeldNate Sudfeld2017PHIPHI1192382.61345.8134.000.000.032490.9
Colt McCoyColt McCoy2019WASWAS1182766.71224.5122.000.013.764461.0
Jake DelhommeJake Delhomme2011HOUHOU1182864.32117.5211.013.600.021899.0
Todd BoumanTodd Bouman2010JAXJAX1183452.92226.5222.025.925.91668.5
John NavarreJohn Navarre2004ARIARI1184045.01684.2168.012.5410.01825.8
Neil O'DonnellNeil O'Donnell2003TENTEN1182766.72328.6232.027.413.700102.7
Marcus MariotaMarcus Mariota2020LVLV1172860.72268.1226.013.613.60083.3
Brock BerlinBrock Berlin2007STLSTL1172860.71535.5153.000.013.60060.6
George IzoGeorge Izo1962WASWAS1173745.92847.7284.038.1410.859.8
Richard BartelRichard Bartel2010ARIARI1162857.11505.4150.000.013.621257.1
Jamie MartinJamie Martin2004STLSTL1163053.31886.3188.000.000.02672.6
Glenn FoleyGlenn Foley1995NYJNYJ1162955.21284.4128.000.013.442152.1
Sean SalisburySean Salisbury1994MINMIN1163447.11564.6156.000.012.91648.2
Wade WilsonWade Wilson1983MINMIN1162857.11244.4124.013.627.132250.3
Brian HoyerBrian Hoyer2020NENE1152462.51305.4130.000.014.221859.4
Matt BarkleyMatt Barkley2018BUFBUF1152560.02329.3232.028.000.018117.4
StatMuse has season-level data for completions going back to the 1932 season.

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