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Murphy is a former student of Banbridge High School and came through the Ulster Academy before making his debut for the province in the 2016/17 season.
Commenting on the signing, Connacht Defence Coach Peter Wilkins said: “We are delighted that Jonny Murphy has signed for Connacht ahead of the 2018/19 season. He is a powerful and robust forward who will provide increased options to our game.”
Following his signing, Jonny Murphy added: “I am relishing the challenge of joining Connacht and looking forward to joining the squad for pre-season training. There is huge competition at the moment for that number 2 jersey and I hope to add to that further. Connacht have a loyal community of fans and I look forward to representing them when I arrive in the Sportsground.”