The Cats ball-magnet has enjoyed another strong season in the hoops this year, backing up his All-Australian and Carji Greeves Medal-winning campaign of 2020 in style.
The 29-year-old has recorded career-high numbers for disposals, inside 50's, clearances and contested possessions this season as the Cats continue their push for a premiership.
A free agent in 2021, Guthrie is the latest Cats star to lock away his future with Geelong for the long-haul.
The double coups will see Geelong add to their impressive season of retentions, with Tom Atkins (2023), Jed Bews (2024), Sam De Koning (2023), Jack Henry (2024), Jake Kolodjashnij (2024), Gryan Miers (2023), Esava Ratugolea (2023), Joel Selwood (2022), Cooper Stephens (2023) all signing new deals in 2021.
Despite being among a list of long-serving veterans at Geelong, Guthrie is yet to taste premiership success, having missed selection for the Cats' premiership side in 2011 under Chris Scott.
Geelong will face Melbourne on Friday night at Optus Stadium in hope of securing a place in the AFL Grand Final for the second-straight season.