The progressive recognition and petrological characterization of Neoproterozoic igneous rocks in the Ossa-Morena Zone can be dated back several decades and continues so far eagerly. Soon after the plate tectonics revolution of the twentieth century sixties, a continental arc plate convergence setting was envisioned to explain the magmatic, metamorphic and tectonic evolution of the Ossa-Morena Zone in the context of the SW branch of the Iberian Massif. Rigorous identification of calc-alkaline Ediacaran‒Terreneuvian granitoids and volcanosedimentary suites followed shortly. They were ascribed to a magmatic arc together with coeval and younger Cambrian arc rock successions. Since then, an improved geochronological knowledge of magmatic rock protolith ages and a refined chronostratigraphic Neoproterozoic‒Cambrian context have helped significantly to reorganize and establish a consistent genetic connection between petrologically diverse and geographically unconnected arc igneous rocks. This and the complementary consideration of detailed geochronological, petrostructural, tectonic and geochemical studies has resulted in a profuse publication of magmatic arc models with implications for the palaeogeographic organization of the peri-Gondwanan exterior orogens during the Ediacaran‒Cambrian interval. The descriptive sections of this chapter present two principal Cadomian igneous rock groups, preorogenic and synorogenic, ascribed to the 690‒550 Ma (late Cryogenian‒Ediacaran) and 550‒530 Ma (latest Ediacaran‒Fortunian) time intervals. Within each group, volcanic and plutonic units are described in separate, and in the latter case distinct plutons (including arc root and metamorphic complexes) are described in specific subsections. Serpentinized/metasomatized ultramafic rocks are considered in separate due to their intrinsic tectonic significance. Upper Terreneuvian (<530 Ma) to Lower Ordovician (480‒470 Ma) intrusive rocks of the Ossa-Morena Zone, and notably the volumetrically important Miaolingian to Furongian magmatic suites, are considered to postdate the Cadomian arc rocks. The oldest of them likely marked the early stages of rifting during the onset of the Variscan Wilson cycle in several areas of North Gondwana, but the possibility they were still connected to latest stages of the Cadomian arc should not be completely discarded.