The Premier League side announced this afternoon that they had agreed a two-year contract extension with the Italian, who has helped steer the Swans away from relegation in his four months at the club.
"I am honoured to be given the chance to continue managing this wonderful club," Guidolin told the Swans' website.
"I came into the club at a difficult time and it was my first experience of the Premier League. Now I have the possibility to start my work at the beginning of a new season; something I'm excited about.
"I would like to thank my players first of all, plus the staff and our fans. It was very emotional for me to hear them sing my name after the game at West Ham (on Saturday) and I've had nothing but good wishes from everyone I've met on the streets of Swansea."
Swansea have climbed up to 11th thanks to seven wins in 15 league matches since Guidolin, 60, arrived in South Wales.