  We use the expansion of superalgebras procedure (summarized in the text) to
derive Chern-Simons (CS) actions for the (p,q)-Poincare supergravities in
three-dimensional spacetime. After deriving the action for the (p,0)-Poincare
supergravity as a CS theory for the expansion osp(p|2;R)(2,1) of osp(p|2;R), we
find the general (p,q)-Poincare superalgebras and their associated D=3
supergravity actions as CS gauge theories from an expansion of the simple
osp(p+q|2,R) superalgebras, namely osp(p+q|2,R)(2,1,2).
