Some 12,500 runners set off on the 13.1m race from Hyde Park in aid of Mind, Asthma UK, Help a London Child, Right to Play and Unicef.
Runners jogged through Kensington Gardens, Green Park and St James’s Park before the race ended in a double triumph for Kenya, with male and female winners.
Edwin Kipkorir, won in 1 hour, 5 minutes, with Mirriam Makewa, 24, finishing in 1 hour 14 minutes.
Around 40,000 spectators watched the race.
Celebrity runners included Ben Fogle, Nell McAndrew, Tana Ramsay, Jenni Falconer, the Cheeky Girls and Ricky Groves.
Brakes sponsored the marathon.
The first celebrity to cross the line - 14 minutes behind the female winner – was Nell McAndrew. Jenni Falconer was the second celebrity across the line.
Sara Lom, chief executive of the Royal Parks Foundation, said: "Since its launch three years ago, this half marathon has become one of the top three races in the UK."
Philip Jansen, chief executive at Brakes Group, said: "We hope the half marathon will motivate people to enjoy a healthier lifestyle and help raise millions for charity."
The race day also featured a Hearts & Heritage Walk, a walking challenge; Pulse3K, a race for 11-16 year olds, and the Brakes Food & Fitness Festival.