  We propose an embedding of $U(N_c)$ QCD$_3$ with a Chern-Simons term in
string theory. The UV gauge theory lives on the worldvolume of a Hanany-Witten
brane configuration in type 0B string theory in the presence of Sagnotti's
O$'3$ orientifold. We use the brane configuration to propose a magnetic Seiberg
dual. We identify various phases of the magnetic theory with conjectured phases
of QCD$_3$. In particular the symmetry breaking and bosonization phases are
both associated with condensation of the dual squark field. We also discuss the
abelian theory without Chern-Simons term and argue that flavour symmetry is not
broken. Finally, we also predict novel type 0B string dynamics from QCD
dynamics.
