Abstract: This study examined the effect of community based organizations activities on poverty alleviation in Yewa South Local Government Area of Ogun State Nigeria. The community development associations and clubs/societies in the area formed the major organizations in the survey. The hypotheses were tested to determine the relationship between socio-economic characteristics and membership. There is significant relationship between membership of Community Based Organisations (CBOs) and marital status, occupation and level of education i.e. p>0.05. The effect of projects executed and poverty level showed no significant relationship i.e., p>0.05. The results showed that majority of community based organization members (80%) are men except for organizations having exclusively female membership. Total 35% of community based organization members are public servants, while retirees formed 20%, farmers 28%, traders and company workers formed 10 and 7%, respectively. The respondents’ perception of membership criteria indicated that being an indigene (55%) socio-economic status (30%) and age (15%) are the major factors.