End of the Rainbow introduces social enterprise as an opportunity for some LGBT organizations to diversify their funding base, contribute to their financial sustainability and increase their social impact. We explore the growing interest in LGBT social enterprise around the world and the myriad of social enterprise models LGBT organizations are undertaking. We also explore the lessons learned by LGBT organizations — and the challenges they face — in developing and managing social enterprises. Finally, End of the Rainbow recommends several ways in which donors and others can foster and support social enterprise in order to enable LGBT organizations to realize their full potential.