  We investigate the weak gravity bounds on the U(1) gauge theory and scalar
field theories in various dimensional noncommutative space. Many results are
obtained, such as the upper bound on the noncommutative scale $g_{YM}M_p$ for
four dimensional noncommutative U(1) gauge theory. We also discuss the weak
gravity bounds on their commutative counterparts. For example, our result on 4
dimensional noncommutative U(1) gauge theory reduces in certain limit to its
commutative counterpart suggested by Arkani-Hamed et.al at least at tree-level.
