The MIRTK is a research-focused image processing toolkit, developed at the BioMedIA research group. It provides a collection of libraries and command-line tools to assist in processing and analyzing imaging data. The main application of the MIRTK is in adult and neonatal brain MR image registration as well as the reconstruction of cortical surface meshes. The modular project organization of the MIRTK enables the installation of selected modules. WWW: https://mirtk.github.io/