Nikki Hiltz (/ˈhɪlts/ HILTS; born October 23, 1994) is an American middle-distance runner specializing in the 1500 meters and mile. Hiltz holds the American record in the mile and is the 2023 US 1500 m champion. They won a silver medal at the 2024 World Indoor Championships.

Hiltz competed collegiately for the Oregon Ducks and Arkansas Razorbacks.

Assigned female at birth, they came out as transgender and nonbinary on International Transgender Day of Visibility, March 31, 2021. They have been competing in the Women's category.

At the 2024 Paris Olympics, Hiltz finished seventh in the Women's 1500 meter final.

While attending Aptos Middle School, Hiltz ran a 400 m in 1:07.41 (2009), an 800 m in 2:51.54 (2008), a high jump of 1.37 m (2009), and long jump of 3.94 m (2008). At Aptos High School, Hiltz won 6 California Interscholastic Federation (CIF) Central Coast Section titles.

	Event	Time	Date	Location	Year
Outdoor	200 m	26.51	4 May 2013	Soquel, California	12th grade
	400 m	57.11	27 April 2013	Aptos, California	12th grade
	800 m	2:09.50	18–24 May 2013	Salinas, California	12th grade
	1500 m	4:26.13	23 June 2011	Eugene, Oregon	10th grade
	1600 m	4:42.45	2 June 2012	Clovis, California	11th grade
	Mile	4:51.52	30 March 2013	Palo Alto, California	12th grade
	3200 m	10:48.23	13 April 2013	Santa Cruz, California	12th grade
	300 m hurdles	47.86	7 May 2011	Santa Cruz, California	10th grade

Hiltz is a 6 time NCAA Division I All-American. Hiltz began their college career at Oregon in 2014 before transferring to Arkansas in 2016.

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. Hiltz was a 2015 NCAA Division 1 & Pac-12 Conference Track and Field Team Champion as a member of the Oregon Ducks at the 2015 NCAA Division I Outdoor Track and Field Championships.

After the 2015 season, Hiltz transferred to Arkansas. 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. Hiltz placed 6th in the mile, finishing with a time of 4:34.57 at the 2017 NCAA Division I Indoor Track and Field Championships.

In 2018, Hiltz earned First Team NCAA Division I All-America honors in the 1500m Outdoors at the 2018 NCAA Division I Outdoor Track and Field Championships for the Arkansas Razorbacks. Hiltz also placed 3rd in the mile at the 2018 NCAA Division I Indoor Track and Field Championships.

	Event	Time	Date	Location	Year
Outdoor	800 m	2:05.83	11–13 May 2017	Columbia, South Carolina	JR-3 Arkansas
	1500 m	4:09.40	6–9 June 2018	Eugene, Oregon	SR-4 Arkansas
Indoor	800 m	2:05.16	27 January 2018	Fayetteville, Arkansas	SR-4 Arkansas
	1000 m	2:45.94	15 January 2016	Fayetteville, Arkansas	SO-2 Arkansas
	1500 m	4:15.40	3 February 2018	New York City, New York	SR-4 Arkansas
	Mile	4:32.59	9–10 March 2018	College Station, Texas	SR-4 Arkansas
	3000 m	9:04.64	9–10 February 2018	Seattle, Washington	SR-4 Arkansas
XC	3.1 miles	16:41.9	1 October 2016	Fayetteville, Arkansas	JR-3 Arkansas
	5 km	16:55.1	29 September 2017	Notre Dame, Indiana	SR-4 Arkansas
	6km	19:35.5	10 November 2017	College Station, Texas	SR-4 Arkansas

In 2018, Hiltz signed with Adidas and trained with The Mission Athletics Club, now known as The Golden Coast Track Club based in California after running a 1500 m time ranked in the top 100 in the world. In January of the same year they ran a then-personal best 2:05.16 in the 800 m. Later in the year Hiltz ran the Aetna Falmouth Mile placing 4th in 4:32.29. They followed up with a 5th-place finish at the Memphis Ed Murphey Mile with a time of 4:32.59. They also ran the Bay Shore Hoka One Long Island Mile placing 12th in 4:39.23. Hiltz ranked 92nd in the world in the 1500 m with a personal best of 4:09.14.

Hiltz ran an indoor 3000 m (9:04.32) at the JDL Fast Track Invitational, won the indoor mile (4:31.42) at the Husky Classic, and at the 2019 USA Track & Field Indoor Championships placed 5th in the mile (4:32.40) and 15th in the 2 mile (9:55.50). Later that year, Hiltz won the 800 m (2:01.37) at the 2019 Bryan Clay Invitational, won the 1500 m (4:07.71) at the 2019 USATF Distance Classic, runner-up in the 1500 m (4:05.56) at 2019 Portland Track Festival, won the 800 m (2:02.93) at the 2019 Adrian Martinez Classic, won the 1500 m (4:05.97) at the 2019 Sunset Tour. They also placed 3rd in the 1500 m (4:03.55) at the 2019 USA Outdoor Track and Field Championships. Hiltz ranked 19th in the world in the 1500 m with a personal best of 4:01.52 in the semi-finals of the 2019 World Athletics Championships.

Hiltz ran the mile at the Millrose Games in 4:24.45, splitting a 1500 m time of 4:07.09 and placing 5th with an indoor personal best.

In New York, Hiltz competed in the 1500 m at New Balance Indoor Grand Prix. At the 2021 United States Olympic trials, Hiltz contested both the 800 m and 1500 m. They failed to qualify for the final in either event placing 13th in the 1500 m and 17th in the 800 m.

In the summer of 2022, no longer sponsored by Adidas, Hiltz announced that they had signed with Lululemon. On September 11, Hiltz finished second in the 2022 the Fifth Avenue Mile in 4:17.4 behind winner Laura Muir.

Nikki Hiltz won their first outdoor USATF Outdoor National Championship title in the 1500 in 4:03.10, moving from 3rd to 1st in the last 300m. On July 21, 2023, Hiltz finished 6th in the mile at the Monaco Diamond League in a time of 4:16.35, a personal best, North American Area Record and an American Record.

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.

In an effort to test endurance, Hiltz decided to contest the 2 mile at the 2024 Millrose Games rather than their specialty event, the mile. Competing on February 11, they placed 4th in a time of 9:15.80 which improved upon their personal best set in 2019 by almost 40 seconds. The following week, Nikki contested the 1500 m at the US Indoor Championships in Albuquerque, successfully defending their US indoor title in a time of 4:08.35. 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. In the final, Hiltz took second place behind Freweyni Hailu in a personal best of 4:02.32, earning a first global medal and becoming the first American to medal in the event since Regina Jacobs in 2003. Hiltz was joined on the podium by fellow American Emily Mackay who took bronze.

In the 2024 US Olympic Trials, Hiltz competed in the 1500m run and made it through the preliminaries and semifinals. In the final, Hiltz won in a time of 3:55.33, thereby making the Olympic Team, and also setting a new trials record.

At the 2024 Paris Olympics, Hiltz finished 3rd in both their preliminary heat and semifinal heat, qualifying for the final. In the Women's 1500 meter final, Hiltz finished seventh with a time of 3:56.38.

	Event	Time	Date	Location
Outdoor	800 m	1:59.03	14 April 2023	Azusa, California
	1500 m	3:55.33	30 June 2024	Eugene, Oregon
	Mile	4:16.35	21 July 2023	Monaco
	5 km	16:35	22 November 2018	San Jose, California
Indoor	800 m	2:02.51	7 February 2021	Fayetteville, Arkansas
	1000 m	2:34.09	27 January 2024	Seattle, Washington
	1500 m	4:02.32	3 March 2024	Glasgow, Scotland
	Mile	4:24.45	8 February 2020	New York City
	3000 m	8:39.92	11 February 2024	New York City
	2 miles	9:15.80	11 February 2024	New York City

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. Thousands of people have supported the race.

Since 2020, Hiltz has been in a relationship with Emma Gee, the first openly LGBT student-athlete to compete for Brigham Young University. Gee later competed for Temple University where she qualified for the 2021 NCAA Division I Outdoor Track and Field Championships.

Representing the  United States

Year	Competition	Venue	Position	Event	Time
2019	Pan American Games	Lima, Peru	1st	1500 m	4:07.14
	World Championships	Khalifa International Stadium	12th	1500 m	4:06.68
2023	World Championships	Budapest, Hungary	17th	1500 m	4:00.84
2024	World Indoor Championships	Glasgow, Scotland	2nd	1500 m	4:02.32
	Olympic Games	Paris, France	7th	1500 m	3:56.38

Representing Aptos High School (2011–12), Arkansas Razorbacks (2017–18), Adidas (2019–21), and Lululemon (2022-present)

Year	Competition	Venue	Position	Event	Time
2011	USA Junior Track and Field Championships	University of Oregon	4th	1500 m	4:26.13
2012	USA Junior Track and Field Championships	Bloomington, Indiana	6th		4:29.52
2017	USA Outdoor Track and Field Championships	Sacramento State University	6th		4:10.28
2018	USA Outdoor Track and Field Championships	Drake University	9th		4:15.03
2019	USA 1 Mile Road Championships	Des Moines, Iowa	1st	Mile	4:29.7
	USA Outdoor Track and Field Championships	Drake University	3rd	1500 m	4:03.55
2021	United States Olympic Trials	University of Oregon	13th		4:10.60
			17th	800 m	2:01.42
2022	USA Indoor Track and Field Championships	Spokane, Washington	10th	1500 m	4:10.7
	USA Outdoor Track and Field Championships	University of Oregon	6th	1500 m	4:10.97
2023	USA Indoor Track and Field Championships	Albuquerque, New Mexico	1st		4:17.10
	USA 1 Mile Road Championships	Des Moines, Iowa		Mile	4:28.0
	USA Outdoor Track and Field Championships	University of Oregon		1500 m	4:03.10
2024	USA Indoor Track and Field Championships	Albuquerque, New Mexico			4:08.35
	United States Olympic Trials	Eugene, Oregon			3:55.33

Representing the Oregon Ducks (2014–15) and Arkansas Razorbacks (2015–2018)

Year	Competition	Venue	Position	Event	Time
2015	NCAA Indoor Track and Field Championships	Randal Tyson Track Center	11th	Mile	4:38.47
	NCAA Outdoor Track and Field Championships	Hayward Field	11th	1500 m	4:31.26
2016	NCAA Indoor Track and Field Championships	Birmingham, Alabama	5th	DMR	10:59.22
	NCAA Cross Country Championships	Terre Haute, Indiana	151st	6 km	21:04.8
2017	NCAA Indoor Track and Field Championships	College Station, Texas	6th	Mile	4:34.57
	NCAA Indoor Track and Field Championships	Hayward Field	2nd	1500 m	4:13.80
	NCAA Cross Country Championships	Louisville, Kentucky	87th	6 km	20:37.2
2018	NCAA Indoor Track and Field Championships	College Station, Texas	3rd	Mile	4:32.59
	NCAA Outdoor Track and Field Championships	Hayward Field	2nd	1500 m	4:09.14

• Nikki Hiltz at World Athletics
• Nikki Hiltz's Aptos High School results
• Nikki Hiltz's University of Arkansas official Track profile
• Nikki Hiltz – University of Oregon profile at TFRRS
• Nikki Hiltz – University of Arkansas profile at TFRRS
• Nikki Hiltz at www.USATF.org
• Nikki Hiltz at Team USA
• Nikki Hiltz at Olympics.com