  Reactor neutrino experiments provide a rich environment for the study of
axionlike particles (ALPs). Using the intense photon flux produced in the
nuclear reactor core, these experiments have the potential to probe ALPs with
masses below 10 MeV. We explore the feasibility of these searches by
considering ALPs produced through Primakoff and Compton-like processes as well
as nuclear transitions. These particles can subsequently interact with the
material of a nearby detector via inverse Primakoff and inverse Compton-like
scatterings, via axio-electric absorption, or they can decay into photon or
electron-positron pairs. We demonstrate that reactor-based neutrino experiments
have a high potential to test ALP-photon couplings and masses, currently probed
only by cosmological and astrophysical observations, thus providing
complementary laboratory-based searches. We furthermore show how reactor
facilities will be able to test previously unexplored regions in the $\sim$MeV
ALP mass range and ALP-electron couplings of the order of $g_{aee} \sim
10^{-8}$ as well as ALP-nucleon couplings of the order of $g_{ann}^{(1)} \sim
10^{-9}$, testing regions beyond TEXONO and Borexino limits.
