  KM3NeT/ORCA is a next-generation neutrino telescope optimised for atmospheric
neutrino oscillations studies. In this paper, the sensitivity of ORCA to the
presence of a light sterile neutrino in a 3+1 model is presented. After three
years of data taking, ORCA will be able to probe the active-sterile mixing
angles $\theta_{14}$, $\theta_{24}$, $\theta_{34}$ and the effective angle
$\theta_{\mu e}$, over a broad range of mass squared difference $\Delta
m^2_{41} \sim [10^{-5}, 10]$ $\rm{eV}^2$, allowing to test the eV-mass sterile
neutrino hypothesis as the origin of short baseline anomalies, as well as
probing the hypothesis of a very light sterile neutrino, not yet constrained by
cosmology. ORCA will be able to explore a relevant fraction of the parameter
space not yet reached by present measurements.
