The ex-Nottingham Forest man took just 43 seconds to break the deadlock and set Huddersfield on their way to an emphatic victory at the John Smith's Stadium.
Although he told the official Terriers website after the game that he had 'really enjoyed' his time with the Reds, Lynch added: "It’s great to chip in with a goal against my former club and rub it in against some of my old mates."
For the Reds, Stuart Pearce is facing a battle to boost his squad's confidence ahead of the visit of Brentford to the City Ground on Wednesday night with the Bees themselves boosted by a late winner against Derby which knocked the Rams off the top of the table and means Brentford are level on points with Forest.