According to match statistics Brown, who scored four tries for England, had 65 carries, beat 25 defenders, while conceding no penalties and gaining over 540 metres.
"I'd like to say a massive thank you to everyone who voted for me to be RBS Player of the Championship," said Brown.
"I'm extremely grateful and proud to win this award, particularly as it's decided by the supporters.
"It was disappointing not to win the tournament overall but congratulations to Ireland, and I'm sure we'll come back stronger next season.
"Finally a big thank you to all my team-mates, the backroom staff and coaches for all the help they've given me through the tournament. I couldn't perform on the field without them and it's great to have that support."
Brian O'Driscoll came in a close second with 28% of the vote, after his international career ended on a high with Ireland being crowned the 2014 RBS 6 Nations champions.
Reflecting their achievement, fans leant towards O'Driscoll's team-mates with Andrew Trimble finishing third, Jonathan Sexton fourth and Rob Kearney in fifth place. Scotland's David Denton came in at sixth and England's Danny Care was seventh.
The 16-man shortlist was decided through match statistics, analysing the best performing players across a set range of criteria in this year's RBS 6 Nations. The public then had 48 hours to vote for their RBS Player of the Championship.
Players at every Championship match this year were awarded (or deducted) points based upon a number of different performance categories which cover all aspects of the game.
These categories were proportionately weighted based on the different positions by an algorithm created by RBS and Accenture, official technology partner of the RBS 6 Nations.
PLAYER OF THE CHAMPIONSHIP WINNERS:
2014 - Mike Brown (England)
2013 - Leigh Halfpenny (Wales)
2012 - Dan Lydiate (Wales)
2011 - Andrea Masi (Italy)
2010 - Tommy Bowe (Ireland)
2009 - Brian O'Driscoll (Ireland)
2008 - Shane Williams (Wales)
2007 - Brian O'Driscoll (Ireland)
2006 - Brian O'Driscoll (Ireland)