The 37-year-old becomes the 13th signing for the promoted side, and the goalkeeper has the option to extend his contract by one more year.
During his career, Green has made 267 Premier League appearances, with spells at Norwich, West Ham United and Queens Park Rangers.
The England international agreed to terminate his contract with Leeds, after playing 47 times for Leeds under Garry Monk.
CONFIRMED: #htafc has completed the signing of experienced former @England international 'keeper Robert Green https://t.co/lIyeaaXK0h (AT) pic.twitter.com/tNe2PQpdv8
— Huddersfield Town (@htafcdotcom) 27 de agosto de 2017