The linebacker with the most sacks in an NFL season is Justin Houston of the Kansas City Chiefs. He finished with 22.0 sacks in 2014.
Jared Allen
Derrick Thomas with 7
"Mean" Joe Greene holds the record for most sacks in a month for the Pittsburgh Steelers.
Unfortunately, Karras retired after the 1970 season. The NFL did not begin recording sacks officially until 1982.
Glenn Robinson
There isn't really a record kept for fewest sacks in a season by a player, as there are thousands of NFL players who have not had any sacks. Michael Strahan holds the record for most sacks in a season, at 22 1/2.
The 1986 Chicago Bears
Jared Allen
bruce smith
Derrick Thomas with 7
"Mean" Joe Greene holds the record for most sacks in a month for the Pittsburgh Steelers.
Julius Peppers is the career leader in sacks for the Carolina Panthers. Thru week 5 of the 2008 NFL season, Peppers has amassed 59 sacks in his career with Carolina.
In 1981 Klecko had 20.5 sacks and Gastineau had
Elvis Dumervil of the Denver Broncos. He had 17 sacks.
Through 12 games of the 2012 season that is DE Aldon Smith of the 49ers with 17.5 sacks.
Mike Berg of the Green Bay Packers had 9 sacks in the 1979-1980 season.
Unfortunately, Karras retired after the 1970 season. The NFL did not begin recording sacks officially until 1982.