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The first direct detection limits on dark matter in the MeV to GeV mass rangeare presented, using XENON10 data. Such light dark matter can scatter withelectrons, causing ionization of atoms in a detector target material andleading to single- or few-electron events. We use 15 kg-days of data acquiredin 2006 to set limits on the dark-matter-electron scattering cross section. Thestrongest bound is obtained at 100 MeV where sigma_e < 3 x 10^{-38} cm^2 at 90%CL, while dark matter masses between 20 MeV and 1 GeV are bounded by sigma_e <10^{-37} cm^2 at 90% CL. This analysis provides a first proof-of-principle thatdirect detection experiments can be sensitive to dark matter candidates withmasses well below the GeV scale.

First Direct Detection Limits on sub-GeV Dark Matter from XENON10