That means if you do a search on, for example, Justin Timberlake, you'll see his most recent tweets along with the related news, biographical information, songs and movies that would typically show up. A Google search for #GameofThrones brings up fan tweets concerning the HBO franchise.
It's a win for Twitter, which will have its content seen by many more people -- including non-Twitter users -- as a result of the deal. The San Francisco-based company is under pressure to grow its user base and prove its relevance.
U.S. users searching in English will see relevant tweets in their results within Google's iOS and Android apps as well as mobile Web. Twitter said a desktop Web version is "coming shortly, and we have plans to bring this feature to more countries in the coming months."
When tapping on a tweet in Google search, users will be taken directly to Twitter, where they can view the tweet and discover additional content.
"By deeply integrating Twitter's real-time content into Google search, we hope you find it easier than ever to explore your interests across both Twitter and Google," Twitter said in a blog post Tuesday.