The Russian, who beat compatriot Maria Sharapova in the semi-finals, claimed her first trophy since winning the Portugal open in May 2013.
She didn’t have it all her own way, however, as she had to come from a set behind to claim the win.
The unseeded Pavlyuchenkova stayed true to her game, going for big shots from the baseline and crushing big serves whilst third seed Errani opted to counterpunch from the baseline.
The Italian claimed seven straight games after trailing 3-1 in the opening stanza to lead by a set and a break in the second. But in what was a topsy-turvy encounter, Pavlyuchenkova reeled off seven straight games of her own to level the match and lead 1-0 in the third.
A backhand return winner ensured a vital break in the third as the Russian went on to seal the victory.
"When I lost seven games in a row I don't really know what happened - maybe I was a little stressed because I was missing some shots and she was so solid," Pavlyuchenkova said.
"Also, I was serving so well throughout the tournament and there were times today where I was struggling on serve.
"But I knew it was from my side, so if I just focused and kept fighting I could get it back."