Hill, who takes up his new role in January 2011, has previously been deputy editor at Shortlist magazine and production/culture editor at Arena.
T3 editor Luke Peters said: "I'm absolutely thrilled that Matt will be the latest addition to the stellar editorial team we have at T3. As technology becomes more mainstream and T3's multi-platform brand grows to appeal to a wider consumer audience, Matt's experience will play a crucial role to T3's future development."
"As a man who has managed to crowbar technology into every possible corner of his life, whether strictly necessary or not, I am obviously ecstatic at joining the ranks of the world's best gadget magazine. It's a very exciting time for T3 as publishing's future is ever more shaped by technological advances, and it now, rather fittingly, boasts a chart-topping iPad edition next to its internationally renowned magazine and website.
"I am very much looking forward to helping Luke and the team take the brand even further."
T3 is published by consumer electronics publisher Future. It has 23 international print editions and recently launched an iPad edition.