The site, which will be available at BBC.co.uk/2012, has been designed to give a "single entry point" to all of the BBC's content related to London 2012, along with hosting classic material from the BBC archives.
It will feature links to external sites and resources, such as volunteering information, as well as details on how to purchase tickets for the events.
In May 2012, the BBC will commence its Torch Relay digital initiative covering the whole of the UK, before reaching a climax at the Opening Ceremony in London on July 27.
The site will also host the World Olympic Dreams project, which features 26 individual stories from athletes striving to achieve Olympic glory in 2012.
The athletes, who hail from as far afield as Vietnam, Namibia and Palestine, will appear in a range of short films for broadcast online, as well as on BBC Breakfast, World News, World Service, the BBC News channel and BBC Radio 5 Live.
Closer to the Games, the 2012 site will provide traffic and travel information for getting to and navigating around London for people attending the Games.
"Telling the story of London 2012 from now until the end of the Games is one of the biggest challenges the BBC has ever undertaken," said BBC director of London 2012 Roger Mosey.
"We want our coverage to bring the whole of the UK together to enjoy this unprecedented period of events, and the BBC's website will be the place where people can find out about everything from the 100 metres final and the latest Olympic News to the greatest cultural performances."
To mark the launch of the London 2012 site, BBC Online will release classic Olympics material from the corporation's archive of television and radio content.
The archive material will show how the BBC coped with its first broadcast of the Games and document the challenges that faced post-war London in hosting its second Olympics on a shoestring budget in 1948.
Earlier in the month, the BBC was forced into an emabrrasing apology after labelling Facebook users "saddos" on an under construction version of the London 2012 site.