Justin Braun (born 13 February 2004) is an American sprinter who specialises in the 400 metres.
from Westerville, Ohio, Braun attended Westerville Central High School. He won Ohio state high titles in 100 metres, 200 metres and 400 metres, his winning time in the 100 m of 10.47 seconds equalling the state meet record. In 2022, he won the New Balance Indoor Nationals 400 m title with a time of 46.21 seconds. After graduating high school he agreed to compete for the University of Southern California.
In 2023 and 2024, Braun was an All-American for the USC Trojans track and field team. After transferring to the University of Florida, Brain ran in the 4 x 400 metres relay at the 2025 NCAA Division I Outdoor Track and Field Championships.
On 14 March 2026, Braun moved to ninth on the world all-time list for the short track 400 metres, finishing runner-up to Nigerian Samuel Ogazi at the 2026 NCAA Indoor Championships in Fayetteville, Arkansas, running the final in 44.67 seconds.