The victory gave Sharapova her first tournament win in almost a year, the former world No.1's last title coming at the low-key Strasbourg claycourt event on the eve of last year's French Open.
But after beating world No.1 Caroline Wozniacki in Saturday's semi-final, Sharapova proved too much for Stosur in a timely boost to her French Open preparations.
"I'm so excited to be able to be champion of this tournament," Sharapova said.
"I'd been to the semis once a few years ago and it means so much to add this title to the ones I've won before."
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Sharapova stuns Stosur in Rome
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