The Cottagers have tied down the 25-year-old on a four-year contract extension after he produced some impressive first-team displays last season.
Stockdale earned rave reviews after saving a penalty in the 2-2 draw with Manchester United and his fine form saw him scoop the club's official Player of the Month award for August.
He was given a further run in the side when Mark Schwarzer headed out to the 2011 Asian Cup with Australia and the Cottagers have now allowed him to pursue regular action at Ipswich.
A statement on the club website read: "Fulham Football Club is pleased to announce that David Stockdale has signed a four-year extension that sees his contract expire with the Club in the summer of 2015.
"The goalkeeper has with immediate effect joined Ipswich Town, on a season-long loan."
Stockdale, who started his career at York, joined the Cottagers from Darlington in 2008, and had loan stints with Rotherham, Leicester and Plymouth Argyle before starring against United.
He was called into the England squad for the first time, and will now be hoping for regular football at Portman Road.
Stockdale is looking forward to life under manager Paul Jewell at Ipswich.
He told Ipswich's official website: "I had a great talk with the gaffer here and Ipswich Town is a big club so I was eager to come here.
"The manager told me about the quality of the signings he's made and where they're heading and everything he told me made me keen to join the club.
"Now I'm just looking forward to getting going and playing my part in what I hope will be a successful season for Ipswich."