成长骇客（英语：Growth hacker），又译增长黑客、营运成长骇客、流量成长骇客，使用Growth hacking技巧，来进行市场行销。常在新创公司使用，使用创新思维、批判性思考与统计手法，达成增加公司产品销售，与增加顾客的目标。这个名词首次出现在2010年，包括LinkedIn，Twitter，YouTube与facebook等公司，在公司内部都使用了这个技巧来组成团队，以增进其网站流量及公司营收。

Growth hacking is a process of rapid experimentation across a range of marketing channels to identify the most effective ways to grow a business. The term is typically applied to customer acquisition, retention and monetization strategies used by newly-formed companies, which don’t have the resources to employ standard corporate marketing strategies. Growth hackers are marketers, engineers and product managers that are trained to specifically focus on building and engaging the user base of a business. Growth hackers often focus on low-cost alternatives to traditional marketing, e.g. using social media and viral marketing instead of buying advertising through more traditional media such as radio, newspaper, and television.