Mark Allan Fahleson (born January 26, 1967, in Kansas City, Missouri) is a Nebraska attorney.
Fahleson served as a judicial clerk to the Honorable D. Nick Caporale of the Nebraska Supreme Court.
From 1995 until October 1997 Fahleson served as Chief-of-Staff and Legislative Director for U.S. Representative Jon Christensen.
On January 8, 2011, he was unanimously reelected to a second term as the Nebraska Republican Party's top official.
With the national media and political press present, in 2012 Fahleson chaired a contentious Nebraska Republican Party state convention that delivered the remaining delegates for eventual nominee Mitt Romney.