  We study static, spherically symmetric equilibrium configurations in extended
theories of gravity (ETG) following the notation introduced by Capozziello et
{\it al}. We calculate the differential equations for the stellar structure in
such theories in a very generic form i.e., the Tolman-Oppenheimer-Volkoff
generalization for any ETG is introduced. Stability analysis is also
investigated with special focus on the particular example of scalar-tensor
gravity.
