  Cosmic electrons, positrons, protons, and antiprotons carry essential
information about both astrophysical processes and fundamental physics. Charged
particles provide signatures of dark matter annihilation or decay, \emph{in
situ} in the universe, that are complementary to the other messengers of
indirect dark matter detection, gamma rays and neutrinos. We discuss the
science potential for measurements of charged particles by the Cherenkov
Telescope Array (CTA), an instrument under development primarily for the study
of cosmic gamma rays with energies $30\ \textrm{GeV} - 200\ \textrm{TeV}$.
