The purpose of this study is to propose full-analytical closed-form solutions for functionally graded magneto-electro-hygro-thermo-elastic (FG-MEHTE) discs exposed to various combinations of the magneto-electro-hygro-thermo-mechanical loads. The formulations account for the elastic, piezoelectric, dielectric, magnetic, piezomagnetic, pyroelectric, pyromagnetic, and hygrothermal properties of the disc. Different exponential through-thickness variations are adopted for distinct material properties. General hygrothermal boundary conditions are taken into consideration and the distributions of the rises in the moisture concentration and temperature are determined according to Fick and Fourier equations, respectively. Based on the constitutive equations of the axisymmetric hygro-thermo-elasticity problem, the Navier equations are derived. The series solutions that are proposed for the displacement field and the electric and magnetic potentials consist of appropriate superpositions of exponential and Bessel functions whose arguments are ascertained based on the edge conditions. The boundary conditions of the top and bottom faces of the disc are employed to determine the unknown coefficients of the mentioned series solutions. Results reveal that by increasing the volume fraction of the piezoelectric phase, the electric potential increases but the magnetic induction and the magnetic potential decrease in such a way that the resulting distributions of the axial and radial magnetic inductions become respectively, similar to those of the transverse normal and transverse shear stresses. In contrast to the reductions in the displacements and stresses, the magnitude of the transverse shear stress and electric and magnetic potentials grow with the thickness.