  It is suggested that fast radio bursts can probe gravitational lensing by
clumpy dark matter objects that range in mass from $10^{-3}M_{\odot}$ to $10^2
M_{\odot}$. They may provide a more sensitive probe than observations of
lensing of objects in the Magellanic Clouds, and could find or rule out clumpy
dark matter with an extended mass spectrum.
