On Tuesday, "The Greatest Showman" actor shared a sweet photo of both of them on Instagram to commemorate the milestone.
"I love you Deb," Jackman wrote in the caption. "Today is our 27th wedding anniversary. 27 YEARS!! I love you so much. Together we have created a beautiful family. And life."
"Your laughter, your spirit, generosity, humor, cheekiness, courage and loyalty is an incredible gift to me," he added. "I love you with all my heart."
Furness, who is an actress known for her roles in "Legend of the Guardians: The Owls of Ga'Hoole," met Jackman on the Australian show "Correlli."
They tied the knot on April 11, 1996.
The couple has adopted two children: Oscar Maximilian Jackman, 22, and Ava Eliot Jackman, 17.