No it wasn't.
From telegraph.co.uk ;
Just in case the pictures of stuntman Glenn Ennis in a big, blue, beautifully ridiculous bear suit that hit the internet earlier this week weren’t enough to convince you: the Revenant’s bear definitely wasn’t real (and not was it played by Andy Serkis, contrary to some reports). Instead, a combination of CGI and motion capture was used to create the animal attack scene.
“In rehearsals, I would wear a blue suit with a bear head,” Ennis told Global News. “Obviously that doesn’t make it into the film, and the CGI guys paint the bear in. Alejandro [Iñárritu] was adamant that the blue bear moved just like a real bear would move, and it was essential that it had the same nuances that a bear would have. Even though it was a big Smurf bear, it still had to be as authentic as possible.”
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