In the last century, astronomy evolved from optical observation to the
multi-wavelength study of celestial objects from radio waves up to x- and γ-rays,
leading to a wealth of new discoveries and opening the way to high-energy
astroparticle physics. In particular, the recent success of ground-based
very-high-energy γ-ray telescopes has opened a new window on the most powerful and
violent objects of the Universe, giving a new insight into the physical processes at
work in such sources. In the context of high-energy astronomy, neutrinos constitute a
unique probe since they escape from their sources, travel undisturbed on virtually
cosmological distances and are produced in high-energy hadronic processes. In
particular they would allow a direct detection and unambiguous identification of the
sites of acceleration of high-energy baryonic cosmic rays, which remain unknown. This
report discusses the physics potential of the domain and reviews the experimental
techniques relevant for the detection of high-energy (⩾TeV) neutrinos. The results
obtained by the first generation of such detectors are presented, along with the
perspectives opened by new projects and prototypes being currently developed.