Winks, who becomes the first addition under new Foxes boss Enzo Maresca, progressed through the youth set-up at Spurs to make his debut in 2014 and went on to make 203 appearances for his boyhood club.
First-team chances have been more hard to come by in recent seasons and Winks has decided to help relegated-Leicester in their bid to secure promotion from the Sky Bet Championship.
England international Winks first joined Tottenham's academy at the age of five and went on to become a regular during Mauricio Pochettino's tenure.
