Rovers made central midfielder Tom Cairney a permanent signing from Hull earlier in the January transfer window and sign Dabo, 21, who has made just two appearances for the Ligue 1 side this term.
"I'm delighted that he has agreed to join us and come on loan until the end of the season," boss Gary Bowyer told Blackburn's official website.
"He's a positive lad, both on and off the pitch and he brings a different dimension to what we have already got in midfield.
"He can run forward, he can attack the space very well, he can receive the ball ever so well under pressure and we are hoping that he settles in quickly and that he'll be someone that can excite the fans."
Dabo himself is looking forward to the challenge of playing in England.
He added "I'm very glad to be here because I am coming to a good team.
"I'm here to enjoy my football and to play well with the team and maybe catch the play-offs.
"It is a new experience for me - a new country. I'll try to speak English, have a good attitude, keep smiling and enjoy my time here, then everything will be okay."