  In this article, we first establish operator-valued analogues of
multidimensional refined Bohr inequality. Then we establish operator-valued
analogues of multidimensional improved Bohr inequality with a certain power of
the norm of the initial coefficient. Finally, we establish operator-valued
analogues of a multidimensional sharp version of Bohr inequality with the
initial coefficient being replaced by the norm value of the function. In
addition, we establish operator-valued analogues of multidimensional improved
Bohr inequality using the quantity $S_r/\pi$. All the results prove to be
sharp.
