GABAergic interneurons in the cerebral cortex. Neurogenesis is a major factor in establishing cortical circuitry and in fine-tuning the functionality of neural circuits. Neurogenesis begins in the germinal zones of the cortex with the generation of neural precursors that migrate through a variety of routes to populate different layers of the cerebral cortex. Cortical circuits are generated at different stages, based on the different types of neuronal precursors that are generated. Recent findings have demonstrated that, like pyramidal neurons, GABAergic interneurons, most of which are born in the ventral telencephalon, use the rostral migratory stream (RMS) to move toward the cortex, with the exception of callosally projecting chandelier neurons, which use a separate pathway. When born in the germinal zones, GABAergic precursors rapidly migrate to specific regions in the cortex, where they become positioned to form specific GABAergic circuits that are highly adapted to their specific laminar location. Here we review the current knowledge of the development of GABAergic interneuron circuits in the cerebral cortex. In addition, we summarize the mechanisms that guide their migration in the developing cerebral cortex and review how this is influenced by the synaptic activity. Finally, we examine the effects of extrinsic factors and intrinsic regulatory elements that contribute to the development of the different types of cortical GABAergic circuits.