Lynch is thought to be a primary target for R's boss Jimmy Floyd Hasselbaink, with whom he worked at Nottingham Forest when the Dutchman was a coach.
Hasselbaink has also seen long-serving centre-back Clint Hill, who like Lynch is left-footed, depart Loftus Road along with Watford loanee Gabriele Angella.
28-year-old Lynch, who made 40 Championship appearances for the Terriers last season, has a year to run on his contract at the John Smith's Stadium.
Huddersfield handed a new deal to Lynch's defensive partner Mark Hudson in April and have also added German centre-back Michael Hefele this close season - potentially paving the way for the Welshman's exit.
Hefele is a new signing at Huddersfield
Lynch, who hails from Sussex and began his career at nearby Brighton, may fancy a return to the south of England, seven years after he left the Seagulls for Forest.
QPR finished 12th in last season's Championship, seven spots above the Terriers.
Lynch in his Nottingham Forest days