The HOLMES experiment will provide an important step forward in direct neutrino mass measurements with a calorimetric approach as an alternative to spectrometry. HOLMES will perform a calorimetric measurement of the energy released in the decay of \(^{163}\)Ho and will deploy a large array of transition-edge sensor microcalorimeters with implanted \(^{163}\)Ho nuclei. The resulting mass sensitivity could be as low as 0.4 eV, and it will also establish the potential of this approach to extend the sensitivity down to 0.1 eV and lower.