Samoan international Isaac Feaunati, 29, has agreed a new two-year deal, and scrum-half Alan Dickens, 27, and hooker Matt Holt, 31, have both agreed new one-year deals at Headingley.
Feaunati, who will come up against one of his former sides on Sunday, joined the Tykes in 2001 fromYorkshire rivals Rotherham and has been a mainstay of the team ever since. He has made 42 appearances in his two seasons at the club, scoring five tries.
Director of Rugby Phil Davies commented, "Zac has been an important part of our team since gaining promotion to the Zurich Premiership and I am delighted that a player of his experience has pledged his future to the club."
Dickens joined the Tykes from Sale Sharks at the start of this season, originally only on a temporary basis as cover for the injured Scott Benton, however he earned an extended contract with good early performances and has now agreed to stay for a further season.
Davies added: "Alan has become an integral part of squad since moving here last summer and has shown real determination to make the most of his chances."
Australian-born Matt Holt was Phil Davies' first signing upon gaining promotion to the Zurich Premiership from National Division One outfit, Waterloo. This season has seen Holt revert from hooker to prop to cover for injuries in the Leeds ranks.
"Matt has developed incredibly since moving to Leeds and his versatility and willingness to learn are vital to our squad," said Davies.