Midfielder arrives from Colchester for undisclosed fee
The 24-year-old midfielder has signed a contract that will keep him at Portman Road until the summer of 2015, with an option of another year after that.
London-born Anthony progressed through the Academy ranks at Colchester before making his first-team debut in August 2007.
He went on become a regular in their midfield and clocked up just short of 200 appearances, scoring 35 goals.
Joe Dunne made him skipper of the U’s after he took over as manager at the Weston Homes Community Stadium in September 2012.
Anthony spent a few days training with Town at the start of January before finalising the deal this week.