Capped 17 times for Scotland, Berghan, 28, started at tighthead prop in last weekend’s Guinness Six Nations encounter against France.
On extending his stay at the club, Berghan, said: “I’m delighted to be extending my time with Edinburgh and I’m looking forward to contributing to the club going forward.
“I’m excited to be a part of this team and I believe there is still more to come from this great group of players.”
Head Coach Richard Cockerill, added: “Simon is an integral part of the squad and has been a consistent performer for both club and country for a number of seasons.
“He brings a hard edge and strong level of physicality to this team, so we’re delighted that he’ll continue to represent this club in the years to come.”
The New Zealand-born, 18st, 6’3 prop joined Edinburgh from Canterbury-based Crusader Knights – the development squad of the Super Rugby side – in 2014 and immediately earned a reputation for his dominant scrummaging and physicality in the loose.
After solidifying his place in the capital side’s front-row, Berghan was rewarded for his league form when he was named in the Scotland squad for the first time ahead of the 2017 Guinness Six Nations – a campaign in which he came off the bench in three Tests.
Berghan made his 50th Edinburgh appearance in the 2018/19 Guinness PRO14 season opener against Ospreys, while the front-row scored his first try for the club in last month’s bonus-point win over Southern Kings at BT Murrayfield.
The prop has so far made 62 appearances for Edinburgh, while his selection against France – alongside Edinburgh front-row teammates Stuart McInally and Allan Dell – was his 9th start for Scotland in 17 matches played.