This study investigated psychological educational and socio-cultural variables as correlates of women participation in trade unionism in Southwest, Nigeria. The study examined the relationship between each of the sub-variables of psychology (motivation and self-confidence), educational (literacy, semi-literacy and illiteracy), and socio-cultural (culture, marital status, age, religion and economic status) variables and attitude toward women's participation in trade unionism. The study also examined the relative contribution of each of the three independent variables (psychological, educational and socio-cultural) to the women's participation in trade unionism in Nigeria the area.The study is a descriptive research of the survey type. The population for the study consisted of all women civil and public servants in Southwest, Nigeria. Two thousand and four hundred women civil and public servants were selected from 30 Ministries, Departments and Agencies (MDA's) and three public tertiary institutions for this study using the Multistage sampling procedure.