Superfish（大陆称为快鱼）是一间广告软件公司，于2006年在以色列创立。总部位于加州。

Superfish被不少人称为恶意软件。早于2010年，Superfish已经被用来捆绑其他软件。2014年9月，Lenovo开始在旗下笔记本电脑（不包括ThinkPad和台式机）中预载Superfish。被安装的电子产品，不仅会持续弹出广告、还有助骇客窃取用户隐私信息；该软件还可自行签发安全凭证，让用户「把有问题的网站误认为安全」。

美联社2015年2月报导称，Lenovo 产品预载这款软件是「安全大漏洞」，Lenovo 2月底回应宣告禁用该软件，但在此前一度否认、强调快鱼「不会保存/跟踪用户行为，也不记录用户信息。」

Superfish was an advertising company that developed various advertising-supported software products based on a visual search engine. The company was based in Palo Alto, California. It was founded in Israel in 2006 and has been regarded as part of the country's "Download Valley" cluster of adware companies. Superfish's software has been described as malware or adware by several sources. The software was bundled with various applications as early as 2010, and Lenovo began to bundle the software with some of its computers in September 2014. On February 20, 2015, the United States Department of Homeland Security advised uninstalling it and its associated root certificate, because they make computers vulnerable to serious cyberattacks, including interception of passwords and sensitive data being transmitted through browsers.