half marathon

A half marathon is a road running event of 21.0975 kilometres (c. 13 mi 192.5 yd)—half the distance of a marathon. It is common for a half marathon event to be held concurrently with a marathon or a 5K race, using almost the same course with a late start, an early finish, or shortcuts. If finisher medals are awarded, the medal or ribbon may differ from those for the full marathon. The half marathon is also known as a 21K, 21.1K, or 13.1 miles, although these values are rounded and not formally correct.

A half marathon world record is officially recognised by World Athletics. The men's world record time is 57:20, set by Jacob Kiplimo in 2026 in Lisbon. Kiplimo also ran 56:42 in Barcelona but this mark was not ratified by World Athletics due to his proximity to the lead car. The women's world record, in a mixed-gender race, is 1:02:52, set by Letesenbet Gidey of Ethiopia in October 2021 in Valencia, Spain. In a female-only race, the women's world record is 1:05:16, set by Peres Jepchirchir of Kenya in October 2020.