NY released Kanter, 26, last week when it couldn't find a trade partner.
Kanter made the news official in a post on Twitter, saying he looks forward "to helping the Blazers achieve the ultimate goal of competing for a championship".
Selected out of Kentucky with the third overall pick of the 2011 NBA Draft by the Utah Jazz, Kanter (6-11, 250) holds career averages of 11.9 points (53.9% FG, 29.8% 3-PT, 78.2% FT), 7.6 rebounds, 0.8 assists and 22.2 minutes in 560 games (208 starts) over eight seasons with Utah, Oklahoma City and NY.
The Blazers, who host the Golden State Warriors Wednesday night in their final game before the All-Star break, are in fourth place in the West, tied with the Houston Rockets (33-23).
The Blazers had originally signed Kanter to a four-year $70 million offer sheet in the summer of 2015, a figure the Oklahoma City Thunder matched in order to retain the restricted free agent's services. In an effort to experiment with his young core, coach David Fizdale would play him in just three games over a 12-game span, prompting Kanter to publicly voice his frustrations to the NY media over a lack of playing time and those receiving court time ahead of him, namely recent acquisition DeAndre Jordan. Adding Enes Kanter to the roster gives Portland a big man off the bench who can score in bunches and rebound the ball at a high rate. He appeared in 44 games.