In this talk, I will discuss the potential of neutrino detectors as powerful tools in the search for new physics beyond the Standard Model. First, focusing on phenomena that affect neutrino oscillations, I will delve into scenarios such as sterile neutrinos and non-unitarity in the leptonic sector, for which I will use the DUNE Near Detector to project future sensitivities. Additionally, I will constrain non-standard neutrino interactions (NSI) by performing a global fit to oscillation data and coherent elastic neutrino-nucleus scattering (CEvNS). Second, I will explore how neutrino experiments can be utilized as fixed-target facilities to search for feebly interacting particles (FIPs), such as axion-like particles (ALPs) and heavy neutral leptons (HNLs). For this, I will use two different facilities: the DUNE Near Detector complex and our proposal to employ the ProtoDUNE detectors—prototypes of the DUNE Far Detector currently located at CERN—to search for these FIPs.