<p>This study focused on investigating Lamb wave propagation behavior in functionally graded porous piezoelectric (FGPP) material plate. Because of their graded composition, these materials offer special properties that allow for a wide range of engineering applications. The material characteristics of the FGPP plate are considered to vary along the vertical direction, i.e., the thickness of the plate. Since the plate is of piezoelectric material, the Lamb waves are affected by electrical boundary conditions at the surfaces of the plate. The three combinations of boundary conditions: (1) both the surfaces are shorted, (2) one surface shorted, the other open, and (3) both the surfaces are open, considered. Closed-form frequency equations are derived for the above boundary conditions. Numerical computations are performed to analyze the effect of wavenumber, boundary, porosity, and grade coefficient on the phase velocity of Lamb waves. Group velocity curves are plotted for distinct boundaries. A thorough examination is conducted, revealing the electromechanical coupling factor and attenuation with wavenumber variation. Plots are generated to visualize mechanical displacements along both lateral and vertical directions within plate. Variations of electrical potentials and stresses along the thickness directions are also examined. This study provides an in-depth analysis of Lamb waves in FGPP plate and delves insights into their potential applications.</p>