The explosion in mobile apps in the last few years has meant that many new astronomy applications have become available. This catalog is a first attempt to make a list of those of particular interest to astronomy educators. For each mobile app, we give the title, then the developer (in parentheses), the web address for downloading it, and a brief description. Please note that we do not list the devices (or operating systems) each app is available for, since this is changing very fast as developers catch up with the increasing popularity of a variety of smart phones and tablets. At the end, you