The Brazilian playmaker picked up four awards at the club's end-of-season gala on Wednesday night, including the Players' Player of the Season and the Player of the Year.
Coutinho, 23, also landed the Goal of the Season award, for his strike against arch rivals Manchester United in the Europa League, and Performance of the Season after starring against Manchester City at the Etihad Stadium in November.
"Thank you to all the fans," said Coutinho.
"It was a good goal but the most important thing was that we beat them. And now we have our final."
Other award winners on the night included Emre Can, who won the Young Player of the Season, and Brad Smith, who was named the Academy Players' Player of the Season.
Player of the Season
Players' Player of the Season
Performance of the Season
Goal of the Season
— Liverpool FC (@LFC) May 12, 2016