The 25-year-old winger had spent much of last season on loan with the club when they were in the Championship, and has now signed a three-year contract with the Tigers.
“It feels great to be here permanently, especially after what happened here last season,” said Elmohamady.
“It was a great year and I thoroughly enjoyed playing for this club. Everything about it was great – the players, the staff, the fans – and I am delighted to be here again.
“It’s going to be great to play in the Premier League again, especially with Hull City, and I am very much looking forward to the new season.
“Moving here was an easy decision to make. The fans are fantastic and it will be enjoyable to play in front of them in the Premier League.”
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- Premier League