One Run International Half Marathon is an annual global road-running event that began on May 21, 2017. It gained worldwide recognition after being listed twice in the Guinness World Records (2020 and 2021) as the largest half marathon with a synchronized start.

The event became truly international in 2023, expanding to five countries. Its growth accelerated rapidly, reaching 15 countries and over 30,000 participants in 2024, establishing One Run as one of the world’s leading running events. In 2025, One Run achieved a new milestone by uniting 26 countries, with Kazakhstan joining through an online format.

The unique highlight of One Run is its simultaneous start across all participating cities on the same day, symbolizing global unity through sport. The event promotes health, accessibility, cultural exchange, and international friendship, offering race distances of 1 km, 5 km, 10 km, and 21.1 km, welcoming runners of all levels.