  This report summarizes the findings of the CF1 Topical Subgroup to Snowmass
2021, which was focused on particle dark matter. One of the most important
scientific goals of the next decade is to reveal the nature of dark matter
(DM). To accomplish this goal, we must delve deep, to cover high priority
targets including weakly-interacting massive particles (WIMPs), and search
wide, to explore as much motivated DM parameter space as possible. A diverse,
continuous portfolio of experiments at large, medium, and small scales that
includes both direct and indirect detection techniques maximizes the
probability of discovering particle DM. Detailed calibrations and modeling of
signal and background processes are required to make a convincing discovery. In
the event that a candidate particle is found through different means, for
example at a particle collider, the program described in this report is also
essential to show that it is consistent with the actual cosmological DM. The US
has a leading role in both direct and indirect detection dark matter
experiments -- to maintain this leading role, it is imperative to continue
funding major experiments and support a robust R\&D program.

High Energy Physics - Phenomenology;Cosmology and Nongalactic Astrophysics;High Energy Astrophysical Phenomena;High Energy Physics - Experiment