Complementary circuits based on 2D materials show great promise for nextgeneration electronics. An ambipolar all-2D ReSe 2 field-effect transistor (FET) with a hexagonal boron nitride gate dielectric is fabricated and its electronic characteristics are comprehensively studied by temperature dependence and noise measurements. Ambipolar transfer characteristics are achieved owing to the tunable Fermi level of the graphene contact and negligible and 30 meV Schottky barrier heights for the n-and p-channel regimes, respectively. An inverter is also fabricated to demonstrate ambipolar ReSe 2 FET operation in a logic circuit. Furthermore, a p/n switchable unipolar FET is designed and shows potential for building complimentary circuits from a signal device. This work demonstrates the potential of all-2D ReSe 2 FETs and makes available new approaches for designing next-generation devices.