Neuroscientific approaches to multilingualism have seen extensive growth recently. With this expansive development come a variety of identifiable subareas which indicate an exciting and flourishing field. The Handbook of the Neuroscience of Multilingualism is the first handbook-length resource to capture the growing and fruitful intersection between cognitive neuroscience and multilingualism. Authoritative state-of-the-art works are organized within several sections which introduce prominent theories and methods, discuss neural representations in the multilingual brain, explore the functions of the multilingual brain, and engage the reader with a dialogue on the cognitive and neurocognitive effects of multilingualism. This indispensable resource serves as an informative overview for researchers interested in multilingualism from cognitive and neurocognitive perspectives and the logic behind its theoretical and experimental approaches.