The growth properties and magnetic properties of iron films grown by molecular beam epitaxy were studied. The iron film growth was first studied by growing iron on iron whiskers. This work and previous work determined the growth parameters for nearly dislocation free growth. This information was then used to grow iron films on Gallium ArsenideIndium Arsenide alloy substrates. As determined by electron diffraction, layer by layer growth was observed when the iron films were grown. The magnetic properties of the iron films were found to be dependent up on the substrate surface morphology and lattice constant. In particular the coercivity of epitaxed iron film was found to vary by roughly a factor of four when grown on different surface morphologies and substrate lattice spacings. Other research focused on the magnetotransport and magnetooptic properties of the iron film and the effects of the substrate lattice properties on them.