Medieval India refers to a long period of post-classical history of the Indian subcontinent between the "ancient period" and "modern period". It is usually regarded as running approximately from the breakup of the Gupta Empire in the 6th century CE to the start of the early modern period in 1526 with the start of the Mughal Empire, although some historians regard it as both starting and finishing later than these points. The medieval period is itself subdivided into the early medieval and late medieval eras.

Greater India, also known as the Indian cultural sphere, or the Indic world, is an area composed of many countries and regions in South Asia, East Asia and Southeast Asia that were historically influenced by Indian culture, which itself formed from the various distinct indigenous cultures of these regions. The term Greater India, as a reference to the Indian cultural sphere, was popularised by a network of Bengali scholars in the 1920s. It is an umbrella term encompassing the Indian subcontinent and surrounding countries, which are culturally linked through a diverse cultural cline. These countries have been transformed to varying degrees by the acceptance and introduction of cultural and institutional elements from each other. Since around 500 BCE, Asia's expanding land and maritime trade had resulted in prolonged socio-economic and cultural stimulation and diffusion of Buddhist and Hindu beliefs into the region's cosmology, in particular in Southeast Asia and Sri Lanka. In Central Asia, the transmission of ideas was predominantly of a religious nature.