  We investigate the deflection of light by a rotating global monopole
spacetime and a rotating Letelier spacetime in the weak deflection
approximation. To this end, we apply the Gauss-Bonnet theorem to the
corresponding osculating optical geometries and show that the deflection of
light increases due to the presence of the global monopole parameter and the
string cloud parameter, respectively. The results obtained for the deflection
angle in the equatorial plane generalize known results for the corresponding
non-rotating global monopole and Letelier spacetimes as well as the Kerr
solution.
