This year's RBS 6 Nations was one of the closest for years, which made choosing a Player of the Championship a difficult one. The accolade was chosen by fans logging on to the official RBS 6 Nations website.
Fans were asked to select their dream team from every player involved in the Championship after each weekend. When a player was selected for the weekend's dream team it counted towards a final total for each player.
Over 10,000 votes were cast throughout the tournament, with the majority plumping for O'Driscoll.
The 27-year-old O'Driscoll, who will return to action for Leinster on April 1 in their Heineken Cup quarter-final clash with Toulouse, said: ''It's a great honour to be named RBS Player of the Championship especially as this is voted for by rugby fans.
"This award caps a tremendous RBS 6 Nations for Ireland. Whilst we missed out on the title only on points difference, to pick up the Triple Crown at Twickenham was very special.
"I would like to thank the fans for voting and my team mates as it is as much a vote for them as for me.''