  We explore the possibility that dark matter interactions with Standard Model
particles are dominated by interactions with neutrinos. We examine whether it
is possible to construct such a scenario in a gauge invariant manner. We first
study the coupling of dark matter to the full lepton doublet and confirm that
this generally leads to the dark matter phenomenology being dominated by
interactions with charged leptons. We then explore two different
implementations of the neutrino portal in which neutrinos mix with a Standard
Model singlet fermion that interacts directly with dark matter through either a
scalar or vector mediator. In the latter cases we find that the neutrino
interactions can dominate the dark matter phenomenology. Present neutrino
detectors can probe dark matter annihilations into neutrinos and already set
the strongest constraints on these realisations. Future experiments such as
Hyper-Kamiokande, MEMPHYS, DUNE, or DARWIN could allow to probe dark
matter-neutrino cross sections down to the value required to obtain the correct
thermal relic abundance.
