Answered April 26th, 2019

DeMarcus Ware gets his 15th sack, breaking the Cowboys single-season record he shared with Jim Jeffcoat.

Which Cowboys player has the most sacks in a season?
Interpreted as:
Which Cowboys player has the most defensive sacks in a season?
2008Ware2011Ware2010Ware2017Lawrence2007Ware1986Jeffcoat1985Jones2007Ellis1994Haley1984White1983White1996Tolbert1985Jeffcoat2012Ware2006Ware1989Jeffcoat1984Jeffcoat2013Hatcher2012Spencer2009Ware20.019.515.514.514.014.013.012.512.512.512.512.012.011.511.511.511.511.011.011.0
NAMESEASONTMGPSCKTKLASTCOMBSCKYINTINT YDSINT TDFFFRFR TD
DeMarcus WareDeMarcus Ware2008DALDAL1620.0691584113000610
DeMarcus WareDeMarcus Ware2011DALDAL1619.5481058124.5000210
DeMarcus WareDeMarcus Ware2010DALDAL1615.5561066110.5000221
Demarcus LawrenceDemarcus Lawrence2017DALDAL1614.5352358160000420
DeMarcus WareDeMarcus Ware2007DALDAL1614.0602484110.5000400
Jim JeffcoatJim Jeffcoat1986DALDAL1614.000020
Too Tall JonesToo Tall Jones1985DALDAL1613.000000
Greg EllisGreg Ellis2007DALDAL1312.52473182.5000300
Charles HaleyCharles Haley1994DALDAL1612.511000
Randy WhiteRandy White1984DALDAL1612.500000
Randy WhiteRandy White1983DALDAL1612.500010
Tony TolbertTony Tolbert1996DALDAL1612.000020
Jim JeffcoatJim Jeffcoat1985DALDAL1612.0165120
DeMarcus WareDeMarcus Ware2012DALDAL1611.533235663.5000510
DeMarcus WareDeMarcus Ware2006DALDAL1611.5591473871411511
Jim JeffcoatJim Jeffcoat1989DALDAL1611.500031
Jim JeffcoatJim Jeffcoat1984DALDAL1611.500011
Jason HatcherJason Hatcher2013DALDAL1511.03474192000200
Anthony SpencerAnthony Spencer2012DALDAL1411.055409583000210
DeMarcus WareDeMarcus Ware2009DALDAL1611.045125751000500
Demarcus LawrenceDemarcus Lawrence2018DALDAL1610.5422163741130210
Charles HaleyCharles Haley1995DALDAL1310.500000
Jim JeffcoatJim Jeffcoat1992DALDAL1610.500000
Randy WhiteRandy White1985DALDAL1610.500000
Anthony DickersonAnthony Dickerson1983DALDAL1610.518030
StatMuse has season-level data for sacks going back to the 1982 season.