The chapter introduces the concept of informal housing supply continuum and the reasons for its presence in urban housing market in India. It throws light on different forms of informal supply systems and demonstrates examples for each supply system along with emerging issues. This chapter has the following intended leaning objectives: ● To understand the reasons for presence of informality in urban housing market. ● To build an understanding about the informal housing supply continuum. ● To understand the different informal housing supply systems in Indian cities through various examples.