The aim of the present investigation is to study the dynamic behavior of partially damaged and undamaged isotropic cylindrical shells. The analysis has been performed using the ANSYS 19.2 software package. The SHELL281 element is an eight-noded element with six degrees of freedom at each node (translations and rotations along and around the x, y, and z axes (u, v, w, θx, θy, θz)). The modal analysis has been performed considering various degrees of damage on the shell due to corrosion. In this present investigation, the corrosion on the upper surface of the shells has been taken under consideration. The total study has been focused on observing the changes in natural frequencies with the change in atrophy depth along with the alteration in boundary condition. The obtained natural frequencies and the corresponding mode shapes of the shells with different boundary conditions have been presented in this present work.