This chapter synthesises current knowledge of informal paratransit services in cities of the Global South and discusses prevailing policy issues and emerging trends. The scope of the chapter is limited to unscheduled public transport and for-hire services operating in whole, or in part, within the informal economy. The chapter focuses on three regions of the Global South: Africa, Asia, and Latin America.It reviews current knowledge in relation to business models, regulatory regimes, and operating practices. While illustrating that the sector is heterogeneous across, and within, these regions, this review shows that informal paratransit services are usually operated by small businesses organised into associations that exert varying degrees of self-regulation. Service operations are seldom free of state regulation, but the extent can vary. Operating environments often have considerable infrastructure deficits, and driver employment conditions can be exploitative.