Abstract. The EUSO experiment is looking for extremly high energy cosmic rays by studying showers developping in the atmosphere, using a telescope installed on the International Space Station. The detection technique is based on the fluorescence emission of Nitrogen and on the Cherenkov light. The large EUSO field of view covers a 500 km diameter area. This permits to significantly increase the statistics of cosmic rays events above 5x10¹⁹ eV, where the GZK cut-off is expected. EUSO is also capable to detect ultra high energy neutrinos, in a way similar to the charged particles. It could also look for lower energy neutrinos (~10¹⁴ eV) corresponding to tau neutrinos crossing the earth.

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