Marshall Reed Kellner (b. Sept. 21, 1999) is an offensive lineman from De Soto High School who walked on at K-State instead of taking his talents to William Jewell or Central Missouri.
A three-year letter-winner at De Soto under head coach Brian King, Kellner was named to the Kansas Football Coaches Association (KFBCA) and The Topeka Capital-Journal Top-11 teams as one of the best 11 players in the state of Kansas among all classes in 2017 after totaling 92 pancake blocks and not allowing a sack.
He also earned first-team all-state honors as a senior from The Topeka Capital-Journal and The Wichita Eagle, and was an honorable mention pick as a junior by the Capital-Journal.