In the present article we are interested in the analysis of nonlocal initial
boundary value problems for some medium oscillation equations. More precisely, we
investigate different types of nonlocal problems for one-dimensional oscillation equations
and prove existence and uniqueness theorems. In some cases algorithms for direct
construction of the solution are given. We also consider nonlocal problem for multidimensional
hyperbolic equation and prove the uniqueness theorem for the formulated
initial boundary value problem applying the theory of characteristics under rather
general assumptions.