This paper is devoted to investigating the following p-Laplacian neutral damped Duffing equation with singularity:where g has a singularity at u = 0. Applying the Manásevich-Mawhin theorem on a continuous case of topological degree, we obtain the existence of a positive periodic solution for this equation.where the nonlinear term g has a strong singularity of repulsive type at u = 0 and satisfies super-linearity condition at u = +∞. It is concluded that there exist infinitely many positive periodic solutions for Eq. (1.1) by applications of the generalized Poincaré-Birkhoff twist theorem. Afterwards, Wang and Ma [11] investigated Eq. (1.1) with g has a strong