The theoretical analysis and observational evidence indicate that a brown d
warf with an effective temperature greater than 1300 K would have a dust cl
oud in its atmosphere. In this Letter, we show that dust scattering should
yield polarized continuum radiation from the relatively warm brown dwarfs a
nd that the polarized flux profile could be a potential diagnostic tool for
the physical properties of dust grains. The degree of polarization that is
due to multiple scattering will be more in the optical region if the parti
cle size is small, while significant polarization should be detected in the
infrared region if the particle size is large. It is pointed out that the
departure from sphericity in the shape of the object due to rapid rotation
and due to the tidal effect by the companion in a binary system ensures tha
t the disk-integrated polarization is nonzero.