In this study, a meshless regularized method of fundamental solution (RMFS) is proposed to solve the electromagnetic scattering problem for three-dimensional perfect electric conductor (PEC) targets. The method is based on integral equation and constructed solutions using de-singularized subtraction and add-back techniques to regularize the singularity and hyper-singularity of the fundamental solution. The performance of the RMFS in terms of convergence and error is evaluated and compared with the Mie series solution, MFS, and the EM simulation software FEKO on the PEC sphere. Finally, several test examples are given. The results show the potential of RMFS in solving three-dimensional electromagnetic scattering problems.