PC-Poisson is an instructional finite element analysis program (for IBM-PCs of the pre-Windows era) for the novice for problems governed by the Poisson equation (for two-dimensional and axisymmetric geometry). The computation code is based upon the Larry Segerlind’s book, Applied Finite Element Analysis, but adds a graphical user interface for receiving input and for displaying output graphically. Poisson’s equation governs steady heat conduction, ideal fluid flow, steady state diffusion, etc. Note: A companion program, MacPoisson, was created for the Macintosh computer.