  Landau system in noncommutative space has been considered. To take into
account the issue of gauge invariance in noncommutative space, we incorporate
the Seiberg-Witten map in our analysis. Generalised Bopp-shift transformation
is then used to map the noncommutative system to its commutative equivalent
system. In particular we have computed the partition function of the system and
from this we obtained the susceptibility of the Landau system and found that
the result gets modified by the spatial noncommutative parameter $\theta$. We
also investigate the de Hass--van Alphen effect in noncommutative space and
observe that the oscillation of the magnetization and the susceptibility gets
noncommutative corrections. Interestingly, the susceptibility in the
noncommutative scenario is non-zero in the range of the magnetic field greater
than the threshold value which is in contrast to its commutative counterpart.
The results obtained are valid upto all orders in the noncommutative parameter
$\theta$.
