<p>The Permo-Carboniferous hypabyssal magmatism is a well-recorded event throughout southwestern Europe, associated with the post-collisional setting that followed the Variscan orogeny. In northern Portugal, this episode is represented by porphyry, lamprophyre, and dolerite dykes, many of which were studied within the scope of this work using methodologies such as isothermal remanent magnetization, frequency-dependence of the magnetic susceptibility, thermomagnetic analyses, and low-field anisotropy of magnetic susceptibility. The main goals are to report the respective magnetic mineralogy and fabrics, to provide insights into magma flow directions and emplacement conditions, and to complement our understanding about the petrogenetic evolution of the aforementioned subvolcanic rocks. The AMS fabrics of most leucocratic lithotypes is normal and undisturbed by tectonic deformation. Such observation is compatible with the average low anisotropy degrees (<i>P</i>_para(%) = 0.92–4.28%) implying passive emplacement of the melts. Kfd measurements indicate that superparamagnetic particles are likely to exist in rare cases, inducing low bulk susceptibilities. Furthermore, inverse fabrics are probably associated with deuteric and/or post-magmatic alterations. Considering the results of the rock magnetism tests, magnetite is present in all specimens (felsic, intermediate, and mafic). Magnetite is dominantly primary in the mafic lithologies, but mostly secondary in the felsic dykes, as well as generated from exsolutions from iron-bearing silicates. Nonetheless, the presence of primary magnetite in the porphyries and microgranites cannot be completely discarded due to possible magma mixing, as suggested by the coexistence of mantled and non-mantled feldspars, as well as previous geochemical and isotopic evidence.</p>