The Forest have signed a free agent.
After his Palmeiras contract ends, he will join on a three-and-a-half-year contract.
He scored 37 goals for the Brazilian side and helped them win their 11th league title.
"I'm very happy to be here - it's a dream for me," said Scarpa, who won one cap for Brazil in 2017.
I can't wait for it to start. I've always wanted to play in the premier league since I was a kid.
I'm a technical player but I've developed my defense over the past couple of seasons. I'm excited to start and I'm very dedicated.
Forest has signed 23 people this year.
He will be in Greece next week for Forest's training camp where they will play two games.
The fourth round of the Carabao Cup will take place on December 21st and Forest will play at Manchester United on December 27th.