The deal sees the 31-year-old join the Cottagers until the end of the season, as they look to shore up what has been a leaky defence.
Turner could even make his debut this Saturday, where his new side face an in-form Sheffield Wednesday at Hillsborough.
The former Hull City man has seen limited playing time of late, having failed to feature for the Canaries since their 4-0 victory over bottom club Blackpool back in the beginning of February.
He told fulhamfc.com: “I’m very pleased to have the deal done.
“As soon as I learned of Fulham’s interest I wanted to come here straight away. I just want to come in and try and make a big influence on the team.”
With the SW6 outfit conceding a staggering 64 goals in the league this campaign, Turner’s arrival will come as a timely boost for both fans and players alike.
Fulham have endured a torrid return to the second tier, following an equally disastrous 2013/2014 season, which ended their 13-year stay in the top flight.
Hovering only just above the drop zone, they will be hoping their new signing will hit the ground running and help them climb up the table.