MATISSE (Multi-AperTure mid-Infrared SpectroScopic Experiment)  is the mid-infrared instrument of the VLTI. It will produce the sharpest images of planet-forming regions in infant stellar systems, central regions of active galaxies, and close environment of massive stars.

MATISSE consists in an interferometer, combining four of the VLT telescopes, together with a spectrometer, working between 3 and 13 microns. It will produce images at an unprecedented resolution of a few thousandth of an arc-second.

The instrument was built by a consortium of 52 people across 6 countries (France, Germany, the Netherlands, Austria, Hungary, Poland). It is currently being installed in Paranal, Chile, and is expected to be open to the scientific community in 2019.