JHTML is the extension given to files that contain HTML markup and additionally elements that reference Java objects. It is an HTML file that also contains Java code. Before the page is delivered to the client's browser, the Java code must be processed by the server. JHTML files were most often associated with the Dynamo web server.

Currently, the JHTML format is rare and is considered obsolete. To some extent it has been replaced by the open JSP format.