HyperNOMAD is a Python package dedicated to the hyperparameter optimization of deep neural networks. The package contains a blackbox specifically designed for this problematic and provides a link with the NOMAD software used for the optimization. The blackbox takes as inputs a list of hyperparameters, builds a corresponding deep neural network in order to train, validate and test it on a specific data set before returning the test error as a mesure of performance. NOMAD is then used to minimize this error. The following appendix provides an overview of how to use the HyperNOMAD package.