  This is the first in a series of papers in which we analyze
medium--resolution spectra of over 400 K and M giants in Baade's Window. Our
sample was selected from the proper motion study of Spaenhauer et al. [AJ, 103,
297 (1992)]. We have measured radial velocities for most of the sample, as well
as line--strength indices on the system of Faber et al. [ApJS, 57, 711 (1985)].
We analyze the random and systematic errors in velocities and line strengths,
and show that the bright (V < 16.0) stars in our sample are predominantly
foreground disk stars along the line--of--sight toward Baade's Window. We find
that most of the bulge K giants have stronger Mg absorption at a given color
than do stars in the solar neighborhood. If the K giants in our sample are
moderately old, we suggest that on average they may have [Mg/Fe] ~ +0.3,
consistent with the results of recent high--resolution spectroscopy in Baade's
Window.
