"I can't thank the people who voted for me enough," he said.
"It's a real honour and privilege to be voted RBS 6 Nations Player of the Championship, and I'm overwhelmed to be in amongst the players shortlisted.
"It's the icing on the cake of an exceptional year for Wales, and it is a privilege to be part of such an exceptional group of people. For my name to be added to the list of players who have won this award in the past is incredible and extremely humbling."
Halfpenny secured 40 per cent of the vote after a 15-man shortlist, for the first time ever, was decided through a mixture of technical statistics and fan sentiment on social media, producing a shortlist more representative of public opinion.
Italy's Alessandro Zanni came in second with 11 per cent of the vote, while Scotland's Stuart Hogg was third with 8 per cent. Over 80,000 people voted to have their say, which was more than three times the number in 2012.
Technical statistics, and crucially, social media sentiment were calculated via a custom-made algorithm created by RBS with the help of Accenture - the official Technology Partner of the RBS 6 Nations.
The formula combines social listening technology on the social forums of the web; Facebook, Twitter and blogs to gauge positive public opinion, along with official Opta match statistics to give fans more influence than ever before.