Recognizing the importance of women's labour force and their high capacity for employment, the present paper deals with estimation of labour supply of women in Khuzestan. This study is based upon existing data about female participation rates, educational level, wage rates and unemployment rates. To estimate the women's labour supply and the related error correction model, the Johansen cointegraion method and annual data from 1966 to 2003 has been used. The findings of the study show that educational level and all its lags decrease the female teenage participation rates significantly. In this age group, when unemployment rates rise, women's labour supply rise too. For women at age 20 and more, the ratio of those holding university degree has positive effect on women's participation rates; and an increase in income per-capita encourages women to tend to work out of home.