Sina Corporation (Chinese: 新浪; pinyin: Xīn Làng, "new wave") is a Chinese technology company. Sina operates four major business lines: Sina Weibo, Sina Mobile, Sina Online, and Sinanet. Sina has over 100 million registered users worldwide. Sina was recognized by Southern Weekend as the "China's Media of the Year" in 2003.

Sina owns Sina Weibo, a Twitter-like microblog social network, which has 56.5 percent of the Chinese microblogging market based on active users and 86.6 percent based on browsing time over Chinese competitors such as Tencent and Baidu. The social networking service has more than 500 million users and millions of posts per day, making it the largest Chinese-language mobile portal.

The company was founded in Beijing in 1998, and its global financial headquarters have been based in Shanghai since October 1, 2001.

Sina App Engine (SAE) is the earliest and largest PaaS platform for cloud computing in China. It is run by SAE Department, which was founded in 2009. SAE is dedicated in providing stable, effective web deployment and hosting service for those corporations, organizations and independent developers. Now more than 300,000 developers in China are using SAE.