The 25-year-old versatile back, who can play at full-back or outside-half, is the latest Gunners player to sign a new deal after club captain Mike Coman extended his stay for another 12 months.
I genuinely believe Edinburgh will be going places in the next few years.
Scotland international Greig Tonks on Edinburgh future
South Africa-born Tonks arrived at Edinburgh in 2012 from Northampton Saints and has made 57 appearances for the capital club in the last three seasons.
Despite representing England at age-grade level during his time at Leicester Tigers, he switched allegiances to Scotland and made his Scotland A debut in a 13-9 win over England Saxons at Kingston Park in January 2013.
His senior international debut came at full-back against Samoa during a quadrangular series in South Africa in June 2013 and he earned his third cap in this year’s RBS 6 Nations as a replacement in defeat to England at Twickenham last Saturday.
Head coach Alan Solomons has seen his squad battle with a number of injuries to reach the European Challenge Cup quarter-finals and produce a stunning win against rivals Glasgow Warriors to land the 1872 Cup in January.
The club are also still in the mix to qualify for next season’s European Champions Cup with eyes on a top-six finish.
“I’ve been at Edinburgh for three seasons now and I feel as though we have a good group of young guys coming through; keen to play for the club,” Tonks said.
“The high points of my time with the club so far have been this season’s run in Europe – particularly the away win in Bordeaux – and last season’s [Heineken Cup] win over Gloucester.
“Of course, beating Glasgow to win the 1872 Cup and winning Player’s Player of the Year are up there too.
“I’m lucky to be around such a good group of people, there’s a good team atmosphere.
“I genuinely believe Edinburgh will be going places in the next few years.”
Tonks is joined in signing a new deal by back-row forward Roddy Grant, who has committed to the club until the end of the 2015/16 season.
The 28-year-old Botswana-born Scotland 7s international has become a Gunners centurion since joining the club from Border Reivers, with his 100th appearance coming against Glasgow Warriors in the 1872 Cup in December 2013.
“I’ve agreed to stay on for a year because I strongly believe in Alan [Solomons] and Stevie [Scott] and going forward with this great group of players at the club,” Grant added.
MORE: The latest football news
MORE: The latest tennis news