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In this work, we model spin transport in multilayer graphene (MLG) stacks with Bernal (ABA) stacking using semi-classical Monte Carlo simulations and the results are compared to bi-layer graphene. Both the D’yakonov–Perel and Elliot–Yafet mechanisms for spin relaxation are considered for modeling purposes. Varying the number of layers alters the band structure of the MLG. We study the effect of the band structures in determining the spin relaxation lengths of the different multilayer graphene stacks. We observe that as the number of layers increases the spin relaxation length increases up to a maximum value for 16 layers and then stays the same irrespective of the number of layers. We explain this trend in terms of the changing band structures which affects the scattering rates of the spin carriers.