Is there a way to run multiple Spring Boot applications with a single Running Configuration in IntelliJ IDEA?

You could create a Compound run type and add all your applications in it. That way you can just run that config and all your apps will start.

Update April 2016:

Multirun Plugin says: Prefer to use built-in support starting from IntelliJIdea 15 https://www.jetbrains.com/idea/help/run-debug-configuration-compound.html

Stéphane's answer works great but if you need additional features you can install the MultiRun Plugin that will allow you to do the same as the Compound run type but with more bells and whistles.

https://plugins.jetbrains.com/plugin/7248

For instance: You can set a delay between each configuration run or run one configuration after another using the Before Launch feature.

See here for more info about how to setup: https://github.com/rkhmelyuk/multirun/wiki/How-to-run-configurations-with-Multirun