The South Australian product was drafted by the Hawks with Pick No.13 in the 2019 AFL draft, making his debut in Round 6, 2020.
The 21-year-old has since played 36 games in brown and gold, including 17 in a career best 2022 season. So far in 2023, Day has featured in the opening three rounds, averaging 25.7 disposals and four clearances per match.
Day's contract was set to expire at the conclusion of the 2023 season, with his new long-term shunning rival interest.
Mark McKenzie, Hawthorn's National List and Recruiting Manager, said the club was thrilled to see Day sign on.
“It is incredibly pleasing Will was eager to continue on the journey here at Hawthorn, he is another important part of what we are building for the future,” McKenzie said.
Sunday morning entertainment sorted 🍿
4 More Years of Daysy Highlights! 👏 pic.twitter.com/bVE8i7H6yY
— Hawthorn FC (@HawthornFC) April 8, 2023
“This long-term deal really solidifies his future in the brown the gold, and we couldn't be happier.
“Will's special talent has been obvious since being drafted to the Hawks, and it's very exciting to see him remain injury-free this season and take his game to the next level, as we knew he could throughout his development.
“Exceptionally tough with an incredibly high footy IQ, we have no doubts Will can continue producing at a high level for our football club for a very long time yet.”
Hawthorn will continue their 2023 campaign with an Easter Monday clash against the winless Cats at the MCG, with play scheduled for 3:20pm (AEDT).