  We consider a system of $ N $ interacting fermions in $ \mathbb{R}^3 $
confined by an external potential and in the presence of a homogeneous magnetic
field. The intensity of the interaction has the mean-field scaling $ 1/N $.
With a semi-classical parameter $ \hbar \sim N^{-1/3} $, we prove convergence
in the large $ N $ limit to the appropriate Magnetic Thomas-Fermi type model
with various strength scalings of the magnetic field.
