A Dissertation submitted to Mzumbe University in Partial Fulfillment of the Requirement for the award of degree of Masters’ degree in Business Administration (Corporate Management).Informal sector is a sector which encompasses all jobs which are not recognized as normal income sources, and on which taxes are not paid. The term is sometimes used to refer to only illegal activity, such as an individual who earns wages but does not claim them on his or her income taxes, or a cruel situation where people are forced to work without pay. This study explored the “The Impact of the growth of labour market in the Informal sector on women in Tanzania”. Data was collected using questionnaire, interview, and observation. Thematical method has been to analyse the data on result oriented productivity, contribution of these women in domestic and informal sector as whole in that way only major things and themes are identified. It was also found that, there are some factors that push these women in the informal sector which includes the limited expansion of labour in the formal sector, excessive cost and regulatory barriers entry into the informal economy which motivates corruption, the increase demand of low-cost goods and services, poverty, challenges and competition they face in the formal sector, independence and retirement. Socially, the factors included marital situation, education and exposure, age, gender inequality, land rights in the society, self-confidence, protection and benefits etc. looking at those findings the researcher came up with recommendations. The researcher recommends that the Government should reach out to these women by giving them support they need or the Government thinks fit. This includes enacting laws, rules and regulations to guide and guard these women in the environments they are operating, moreover they should educate these women on what to do, the ways to operate, their rights, the taxes and turn over to the Government, they should be empowered to sustain the competition and challenges they face, also they need support and protection against their competitors, the formal sector, environments etc. they need the financial access to support and boost their activities.