The North East side have appointed Gold, who will work alongside new defence coach Mike Ford in order to retain the side's Aviva Premiership status.
"This is an exciting challenge and I am delighted to have the opportunity to work in the Aviva Premiership," Gold told the club's official website. "Newcastle Falcons is a big club with big ambitions and an owner who is very determined so anything is possible.
"I know a lot about the players and the traditions of the club so I am really looking forward to the challenge of keeping top-flight rugby in the North East."
Gold has an array of experience in the Premiership and Super 14 following stints as head coach at London Irish and Western Province.