Randall David Johnson (born September 10, 1963), nicknamed "the Big Unit", is a left-handed American starting pitcher who currently plays for Major League Baseball's Arizona Diamondbacks. He is arguably one of the three or four most dominant pitchers of his era (along with Pedro Martínez, Greg Maddux, and Roger Clemens).

The 6-foot-10 Johnson has been celebrated for having one of the most dominant fastballs in the game. He regularly approached, and occasionally exceeded, 100 miles per hour during his prime. However, his signature pitch is a hard, biting slider. Johnson has won the Cy Young Award five times, second only to Roger Clemens' seven.

For all active pitchers through the 2007 season, Johnson is first in strikeouts per nine innings pitched (10.78 -- which is also first for all pitchers in history) and hit batsmen (182 -- fourth all-time), second in strikeouts (4,616 -- third all-time) and hits allowed per nine innings pitched (7.14), second in shutouts (37), fourth in wins (284), sixth in ERA (3.22) and wild pitches (102), and seventh in won-lost percentage (.654). His 4,616 strikeouts are also first all-time among left-handed pitchers.

Randolph Klaus "Randy" Johnson (born June 17, 1944 in San Antonio, Texas) is a former professional American football player. He was the starting quarterback for the Atlanta Falcons in their inaugural season of 1966. In 1974 he played with The Hawaiians of the World Football League.