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Microsoft Expression Web, code-named Quartz, is a WYSIWYG HTML editor and general web design program by Microsoft, replacing Microsoft FrontPage. It is part of the Expression Studio suite. Expression Web is targeted toward professional website designers.

Expression Web allows authoring of web pages integrating XML, CSS 2.1, ASP.NET 2.0, XHTML, XSLT and JavaScript into sites. It requires the .NET Framework 2.0 to operate. Its sibling is Microsoft SharePoint Designer. Expression Web uses its own standards-based rendering engine, different from the browser-based FrontPage, which uses Internet Explorer's Trident engine. Microsoft claims that Expression Web's rendering engine currently provides the most accurate standards-compliant rendering on the market, especially CSS rendering.