Santon joins from Serie A side Inter Milan for a fee of €9.5 million.
The 27-year-old has signed a four-year contract that runs until 30 June 2022.
“I cannot wait to get started and show everyone what I can do,” Santon said.
“Coming to Roma means a lot to me, I really wanted to make the move and being here now has given me a lot of motivation.”
Predominantly a left-back, the right-footer is capable of playing on both flanks or in central defence.
A product of Inter Milan’s academy system, Santon made his senior debut against Roma in a Coppa Italia match in 2009. He went on to make over 100 appearances for the Nerazzurri across two spells with the club.
He has been capped eight times by Italy – making his debut for the Azzurri as an 18-year-old in 2009.
“We know Davide and his ability very well, but what struck me most is his desire for a resurgence in his career,” Roma sporting director Monchi said.
“Davide is a versatile player, and the coach will be able to count on a lad who can comfortably play on both flanks.”
Aside from his spells with Inter, Santon has also represented Cesena and Premier League side Newcastle United during his career to date.
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