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Wenninger, 31, joins Roma Women on loan from Bayern Munich on a deal that runs until 30 June 2023.
The Austria international is Bayern's all-time leading appearance-maker, with her impact on the German club such that she now has a section dedicated to her at the club's museum at the Allianz Arena.
"A big wish of mine is coming true," Wenninger said.
"After 15 years at Bayern, I really wanted to play abroad and Italy was always my preferred destination.
"From the very first conversation, the people in charge at Roma always gave me the feeling that I was absolutely welcome and really wanted here.
"I want to play for all the domestic trophies with the club - and hopefully make some European history too. My ambition is unbroken."
Wenninger will be in action this summer at the Women's European Championship, where she will captain her country.
"We are delighted to be able to welcome Carina, a player with a vast amount of international experience and one who clearly does not need much introduction," said the club's sporting director (women), Gianmarco Migliorati.
"Convincing her to join the club was not difficult - she immediately made it very clear that her desire was to come her to Rome. That desire will be crucial as we head into the new season."
Welcome to the club, Carina!
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