The dramatic increase of low-income, low-skilled youth in labour markets is of concern particularly in developing countries. In some of these countries, young people are nearly three times as likely as adults to be unemployed. Youths are also more likely to work in the informal labour market than adults, in low quality jobs that offer limited socio-economic security, training opportunities, and working conditions. There is unlocked potential that would benefit both individuals and society. Technical and vocational education and training (TVET) is regarded as a means to expand opportunities for marginalised youth. This review systematically examines the evidence base to provide a picture of the types of TVET interventions being used to raise employment. It aims to identify TVET programmes that are effective and ineffective, and to identify areas in which more research needs to be conducted.