I will review and discuss the clustering properties of X-ray selected
AGN based on recent results from deep and moderately deep X-ray
surveys. X-ray selection allows the best estimate of the spatial
clustering of obscured AGN, which remains so far poorly determined. In
the Chandra Msec Fields no significant differences have been found in
the clustering amplitude of obscured and unobscured AGN. Significance
cosmic variance in the clustering amplitude of the total AGN
population has been though observed between the two Msec fields. The
results from the Chandra Msec Fields will be compared with those
obtained from other X-ray and optical surveys to investigate
the cosmological evolution of AGN clustering. Prospects for the major
on-going X-ray surveys (eg. COSMOS) will be finally addressed.