Analytic note by Fathi Arouri - This paper tackles the question of irregular migration in Jordan through its four main aspects. The first concerns irregular labour migrants and has been approached by using figures showing the socio-economic profile of non Jordanians working in Jordan and, additionally, unemployment in Jordan. This is done by assuming close similarities between legal and irregular labour migrants. The second is an attempt to estimate the stocks and describe the characteristics of irregular migrants in Jordan through data collected from arrival and departure statistics. The author focused on the nationalities of persons involved from 1995 to 2007. The third part of the paper is dedicated to refugees in Jordan.