Yahoo! Query Language (YQL) is an SQL-like query language created by Yahoo! as part of their Developer Network. YQL is designed to retrieve and manipulate data from APIs through a single Web interface, thus allowing mashups that enable developers to create their own applications using Yahoo! Pipes online tool.

Initially launched in October 2008 with access to Yahoo APIs, February 2009 saw the addition of open data tables from third parties such as Google Reader, the Guardian, and The New York Times. Some of these APIs still require an API key to access them. On April 29 of 2009, Yahoo introduced the capability to execute the tables of data built through YQL using JavaScript run on the company's servers for free. On January 3, 2019, Yahoo retired the YQL API service.

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Use of the YQL should not exceed reasonable request volume. Access is limited as below: