  We study constraints on the Standard Model Effective Field Theory (SMEFT)
from neutrino oscillations in short-baseline reactor experiments. We calculate
the survival probability of reactors antineutrinos at the leading order in the
SMEFT expansion, that is including linear effects of dimension-6 operators. It
is shown that, at this order, reactor experiments alone cannot probe
charged-current contact interactions between leptons and quarks that are of the
(pseudo)vector (V$\pm$A) or pseudo-scalar type. We also note that
flavor-diagonal (pseudo)vector coefficients do not have observable effects in
oscillation experiments. In this we reach novel or different conclusions than
prior analyses of non-standard neutrino interactions. On the other hand,
reactor experiments offer a unique opportunity to probe tensor and scalar SMEFT
operators that are off-diagonal in the lepton-flavor space. We derive
constraints on the corresponding SMEFT parameters using the most recent data
from the Daya Bay and RENO experiments.
