Dennis Gardeck (born August 9, 1994) is an American football linebacker for the Arizona Cardinals of the National Football League (NFL). He played college football at West Virginia State and Sioux Falls, where he was a nominee for the Harlon Hill Trophy and was a finalist for the Cliff Harris Award. He was signed by the Cardinals as an undrafted free agent in 2018. Gardeck attended Crystal Lake South High School in Crystal Lake, Illinois.
Gardeck signed with the Arizona Cardinals as an undrafted free agent on April 30, 2018. He made the Cardinals roster as an undrafted rookie, playing in all 16 games primarily on special teams.
In Week 14 of the 2019 season against the Pittsburgh Steelers, Gardeck recovered a fumble forced by teammate Darrell Daniels on punter Jordan Berry during a fake punt attempt in the 23–17 loss. For his play in 2019, he was named a Pro Bowl Alternate as a Special Teamer.

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