  We study fully nonlinear parabolic equations in nondivergence form with
oblique boundary conditions. An optimal and global Calder\'{o}n-Zygmund
estimate is obtained by proving that the Hessian of the viscosity solution to
the oblique boundary problem is as integrable as the nonhomogeneous term in
$L^{p}$ spaces under minimal regularity requirement on the nonlinear operator,
the boundary data and the boundary of the domain.
