Christopher Nilsen (born January 13, 1998) is an American athlete specialising in pole vault and high jump. He won the silver medal at the 2020 Summer Olympics in the pole vault event with a jump of 5.97 m (19 ft 7 in).

Nilsen graduated from Park Hill High School in Kansas City, Missouri. Nilsen was raised in hometown of Kansas City, Missouri. Nilsen set the United States high school record in the pole vault at the Missouri Class 5 sectional meet with a clearance of 5.61 m (18 ft 5 in).

Nilsen won 2016 Kansas Relays pole vault.

Nilsen attended the University of South Dakota.

Nilsen is a six-time NCAA Division I First Team All-American, and a three-time NCAA Track and field Pole vault champion. Nilsen holds South Dakota Coyotes school records in the Pole vault indoor 5.80 m (19 ft 0 in) and outdoor 5.86 m (19 ft 3 in).

Nilsen set American & NACAC outdoor pole vault U-20 record 5.75 m (18 ft 10 in) and American & NACAC indoor pole vault U-20 record 5.70 m (18 ft 8 in).

Nilsen honored as 2017 Summit League Indoor Field Athlete of the Year and 2017 Summit League Outdoor Field Athlete of the Year. Nilsen honored on The Bowerman Watch List throughout the 2017 outdoor season.

Nilsen won 2018 Texas Relays clearing 5.80 m (19 ft 0 in), later battled Sam Kendricks at 2018 Drake Relays where he cleared 5.78 m (19 ft 0 in) and described the competition in Des Moines, Iowa to Sioux City Journal.