Duff, the only remaining survivor of the club’s last foray into the Premier League in 2009, will enter an 11th season with the Clarets after penning the new deal on the eve of the return to pre-season training.
The 36-year-old Northern Ireland international has proven to be a loyal servant and one of the club’s best ever buys, following a magnificent career that has carried him on a fairytale journey from non-league football to the Premier League.
Belfast-born Duff initially joined the Clarets for just £30,000 in July 2004 after starting more than 200 league games for Cheltenham Town.
He has since proved a key player under Owen Coyle, Brian Laws, Eddie Howe and, latterly Sean Dyche and, early in the 2013/14 campaign made his 300th appearances for the Clarets (he also made 300 for Cheltenham), putting him in an exclusive club.
Duff’s longevity and form was also recognised with an international recall following a near four-year absence in February, 2012.
The veteran defender recently completed his Pro License coaching badges, but the new deal does not, as reported, include a coaching role.