Nikki Hiltz (/ˈhɪlts/ HILTS; born October 23, 1994)[1] is an American middle-distance runner specializing in the 1500 meters and mile.

At Aptos High School, Hiltz won 6 California Interscholastic Federation (CIF) Central Coast Section titles.

[7] At the 2015 NCAA Division I Indoor Track and Field Championships Hiltz finished in 8th place with a time of 4:38.47 in the mile for the Oregon Ducks.

In 2016 Hiltz, along with Arkansas Razorbacks teammates Daina Harper, Therese Haiss and Jessica Kamilos, placed 5th in the DMR (Distance Medley Relay) with a time of 10:59.22 at the 2016 NCAA Division I Indoor Track and Field Championships.

[20][21] In the first race of the 2024 season, Hiltz won the 1,000-meter run at the Mile City Mayhem Event at the UW Invitational in 2:34.09, setting a personal best and American Indoor Record.

Placing top two, alongside Emily Mackay, qualified Hiltz to compete at the 2024 World Athletics Indoor Championships in Glasgow.

In the qualifying round, on March 1, Hiltz posted the fastest time of the heats, running an indoor personal best of 4:04.34.

[5] In October 2024, it was announced that Hiltz had signed up for the inaugural season of the Michael Johnson founded Grand Slam Track.

[25] In 2020, Hiltz founded Pride 5k, an annual charity race that has raised over $172,000 for The Trevor Project, a non-profit organization focused on suicide prevention efforts among LGBTQ youth.

[29][30] Since 2020, Hiltz has been in a relationship with Emma Gee, the first openly LGBT student-athlete to compete for Brigham Young University.