No — there is no reliable public source currently confirming Nikki Hiltz's handedness.

Nikki Hiltz is an American middle-distance runner specializing in the 1500 meters. They competed collegiately for the University of Oregon after transferring from the University of Arkansas. Hiltz has achieved significant success in their career, including representing the United States in international competitions.

Hiltz is also a prominent advocate for LGBTQ+ rights and visibility in sports. As an openly non-binary athlete, they have used their platform to share their experiences and promote inclusivity within the athletic community. Hiltz has been vocal about the importance of creating safe and affirming spaces for all athletes.

Their professional career has seen them compete at national championships and major global events. Hiltz has consistently been one of the top middle-distance runners in the United States, earning accolades for their performances on the track. They continue to train and compete at an elite level.