Text in English with appendices in Afaan Oromoo (Oromo language) / Despite the imperative of reintegration assistance for returnees of illegal migration, which will enable them to become independent and productive members of the community, the reintegration needs and experiences of returned illegal migrants are neglected in academic studies. The objectives of the study were to explore the socio-contextual factors that gave rise to the illegal migration of the study participants; their illegal migration abuse and exploitation experiences; the reintegration needs they sought after return; and the responses of relevant stakeholders to meet the reintegration needs of the returnees and help them reintegrate into the community. To this end, I conducted a qualitative study in Omo Nada district in 2017. I collected the data by means of indepth interviews, key informant interviews and focus group discussions. I used thematic analysis to analyze the findings. The study revealed that the decision to migrate ‘illegally’ was the result of numerous drivers: poverty, unemployment, political discrimination, family pressure, and absence of legal means, the influence of brokers and smugglers, and socio-cultural and religious factors. The returned migrants experienced various types of abuse and exploitation, including physical abuse, economic, labour and sexual exploitation both on the migration journey and at the place of destination. The long periods of isolation some experienced also resulted in the disintegration of their families. Participants identified the need for support in the form of health services, counselling, housing, employment, skills training, finances, loans and social support from relevant stakeholders such as family, the community, the government and non-governmental organizations. Despite the many needs identified, the relevant bodies provided very little reintegration support. Due to this, the returnees were not able to reintegrate into their communities. Returning to the premigration conditions which drove them to migrate ‘illegally' in the first place, with no hope of any reintegration assistance, led some returnees to re-migrate illegally. Reintegration is a key aspect for return migration. Therefore, to be sustainable and for the reintegration process to be successful it must be widely supported. The consequences of illegal migration and reintegration support must be taken seriously and supported by the government in all its aspects. Government agencies such as the Labour and Social Affairs Office must be capacitated to provide the necessary assistance and supports to effect sustainable integration. / Sociology / Ph. D. (Sociology)