  A feasibility study to extract the polarised gluon density from di-jet events
at HERA in next-to-leading order is presented. It is shown that when taking
next-to-leading order effects into account the asymmetries at HERA remain
measurable and sensitive to the polarised gluon distribution. They can be used
to extract the polarised gluon density in the proton in the region
0.005<x_g<0.4.
