When is it?
Sunday, April 13 at 10am.
Is it on TV?
Yes - the race will be broadcast on BBC1 from 8.30am until 2.30pm.
Where is the best place to watch?There are plenty of pubs all over the whole course where spectators can watch runners go by. Participants cross Tower Bridge and will pass some of London's top tourist attractions too - including the Cutty Sark, Canary Wharf, the London Eye and the Mall, where the finish line is situated.
Can I take part?Not this year, but keen runners can enter a ballot to try and secure a place in next year's race. Alternatively, runners can obtain a charity entry.
How many people take part?The marathon counters for many different types of runners - from professional athletes to those making money for charity. Last year, more than 36,000 people entered the race.
What's it all about?The modern-day marathon was formed by John Disley and Chris Brasher in 1981, with 7,747 runners taking place in the first race. Since then, over 900,000 people have completed the course, with a record high of 37,227 finishing the marathon in 2012.
Anything else I need to know?Double Olympic gold medallist Mo Farah is making his debut in this year's race and will compete against runners including world record-holder Wilson Kipsang. Elsewhere, runners are attempting to break records including the fastest marathon carrying a fridge and the fastest marathon by a marching band.