Informal economic activities among women is a most popular phenomenon in the developing world as well as developed world. Many economists argued that official labor statistics does not reflect all the informal activities which carried out by women. Moreover the female who are engage in economic activities which belong to the informal sector, do not have proper operating place. Sri Lanka is a small Island in the world. Women of the Sri Lanka constitute more than half of the population. But official statistics reflects, contribution of the women to the economy is relatively low. Majority of women’s work are not often measured in quantitative terms and it is not valued in national accounts. By this paper it is try to identify informal sector economic contribution of females who are living in Southern Province, Matara District in Sri Lanka. Among the whole DSD Divisions of Matara District three were selected to the sample. All the study respondents were selected by using the stratified random sampling technique. Hundred and twenty study respondents were chosen to the sample and both primary and secondary data were used to analyze the data. Data were collected through structured questionnaire and quantitatively analyzed them. According to this study most of the respondents were engage in trading sector informal activities. Less contribution was identified in service sector informal activities. Social recognition for their employment was not in a satisfactory level. Further 58% of the respondents have secondary level education. Fifty six percent of them have obtained primary level education. And also the results showed that there is a positive relationship between education level and the monthly income of the women.