That would be Cy Young, who won 33 and lost 10, in 1901 for the Boston team in the American League, in its first year of operation.
Through the 2008 season, that is Mordecai 'Three Finger' Brown who won 29 games in the 1908 season.
Old Hoss Radbourn way back in 1884 won an amazing 59 games according to Baseball Almanac.
Denny McLain, who won 16 straight road games in 1968.
Not through the 2011 MLB season ... the most is 3 and has been done by many pitchers. Through 2011, only 16 pitchers have won 4+ games in a playoff season. Randy Johnson of the 2001 Diamondbacks and Francisco Rodriguez of the 2002 Anaheim Angels won 5. Fourteen other pitchers have won 4, the last being Chris Carpenter of the 2011 St. Louis Cardinals.
Bob Welch of the Oakland Athletics was the last pitcher to win 25 or more games in a season. In 1990, Bob Welch won the American League Cy Young Award with a 27-6 record.
Through the 2008 season, that is Mordecai 'Three Finger' Brown who won 29 games in the 1908 season.
Denny McLain of the 1968 Detroit Tigers with 31 wins.
The Pirates franchise record for most wins by a pitcher in a season is held by Frank Killen who won 34 games in 1893.
Jack Chesbra
There are hundreds of pitchers that accomplished this feat.
Tim Lincecum who won 4 games in the 2010 playoffs/World Series.
Sandy Koufax (27 wins)
Chris Capuano
In 1968, Tigers' pitcher Denny McLain ended the regular season with a record of 31-6. He is the last pitcher in MLB history to win 30+ games in a season.
BiG Ed Walsh ~ Chicago White Sox ~ 41 games
Chicago Bulls won 72 games with a record of 72-10 in the 1995-96 regular season. :)
1998.