This review discusses the charge transfer properties of quantum-confined semiconductor nanocrystals (NCs), including zero-dimensional (0D) quantum dots (QDs), one-dimensional (1D) nanorods (NRs), and two-dimensional (2D) nanoplatelets (NPLs). The properties of these NCs can be tuned through their size, dimensionality, and material composition. Charge transfer is a key step in their photovoltaic and photocatalytic applications, where spatially separated and long-lived electrons and holes are generated. The review covers the electronic and optical properties of 0D, 1D, and 2D NCs, wave function engineering, and carrier dynamics in heterostructures. It discusses the dependence of NC charge transfer on various parameters and the development of the Auger-assisted charge transfer model. Recent advances in understanding multiple exciton generation, decay, and dissociation are also discussed, with an emphasis on multiple carrier transfer. The applications of nanocrystal-based systems for photocatalysis are reviewed, focusing on the photodriven charge separation and recombination processes that dictate the function and performance of these materials. The review ends with a summary and outlook of key remaining challenges and promising future directions in the field.This review discusses the charge transfer properties of quantum-confined semiconductor nanocrystals (NCs), including zero-dimensional (0D) quantum dots (QDs), one-dimensional (1D) nanorods (NRs), and two-dimensional (2D) nanoplatelets (NPLs). The properties of these NCs can be tuned through their size, dimensionality, and material composition. Charge transfer is a key step in their photovoltaic and photocatalytic applications, where spatially separated and long-lived electrons and holes are generated. The review covers the electronic and optical properties of 0D, 1D, and 2D NCs, wave function engineering, and carrier dynamics in heterostructures. It discusses the dependence of NC charge transfer on various parameters and the development of the Auger-assisted charge transfer model. Recent advances in understanding multiple exciton generation, decay, and dissociation are also discussed, with an emphasis on multiple carrier transfer. The applications of nanocrystal-based systems for photocatalysis are reviewed, focusing on the photodriven charge separation and recombination processes that dictate the function and performance of these materials. The review ends with a summary and outlook of key remaining challenges and promising future directions in the field.