Conjugate mixed convection-conduction heat transfer from a vertical, cylindrical fin embedded in a saturated, high-porosity, porous medium is analyzed. The effects of both boundary and inertia forces were taken into account. The numerical solutions of the problem are obtained by a local nonsimilarity method. Results were obtained for the surface curvature parameter 𝛌 = 1, 2, and 4 and other parameters in the range of 0 ≤ Ncc≤ 2.0 and 0 ≤ Ω ≤ 2.0. The heat transfer coefficients are found to follow trends similar to those of the classical fluids. Both boundary and inertia effects decrease the heat transfer rate and become more significant for mixed convection flow, especially downstream and at large values of N NccThe total heat transfer rates are higher for lower values of 𝛌, that is, for larger fin radius r No