Delhi Half Marathon, currently branded as the Vedanta Delhi Half Marathon for sponsorship reasons, is an annual half marathon foot-race held in New Delhi, India. Established in 2005, it is both an elite runner and mass participation event. It is an AIMS-certified course and is listed as a Gold Label Road Race by the IAAF. The race has seen the best of the athletes competing since the course is considered one of the fastest half marathon route. The event sees about 40,000 participants through the race categories of half marathon, the 7 km Great Delhi Run, a 4.3 km run for senior citizens, and a 3.5 km wheelchair race

A half marathon is a road running event of 21.0975 kilometres —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.