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This document describes some of the fundamental astrophysical problems thatrequire observing capabilities at millimeter- and centimeter wavelengths wellbeyond those of existing, or already planned, telescopes. The resultssummarized in this report follow a solicitation from the National RadioAstronomy Observatory to develop key science cases for a future U. S.-led radiotelescope, the "next generation Very Large Array" (ngVLA). The ngVLA will haveroughly 10 times the collecting area of the Jansky VLA, operate at frequenciesfrom 1 GHz to 116 GHz with up to 20 GHz of bandwidth, possess a compact corefor high surface-brightness sensitivity, and extended baselines of at leasthundreds of kilometers and ultimately across the continent to providehigh-resolution imaging. The ngVLA builds on the scientific and technicallegacy of the Jansky VLA and ALMA, and will be designed to provide the nextleap forward in our understanding of planets, galaxies, and black holes.

Key Science Goals for the Next Generation Very Large Array (ngVLA): Report from the ngVLA Science Advisory Council