Inca Quechua Language - Since the Inca Empire lacked a written language, the empire's main form of communication and recording came from quipus, ceramics and spoken Quechua, the language the Incas imposed upon the peoples within the empire. The plethora of civilizations in the Andean region provided for a general disunity that the Incas needed to subdue in order to maintain control of the empire. While Quechua had been spoken in the Andean region, like central Peru, for several years prior to the expansion of the Inca civilization, the type of Quechua the Incas imposed was an adaptation from the Kingdom of Cusco (an early form of "Southern Quechua") of what some historians define as "Proto-Quechua" or Cusco dialect (the original Quechua dialect).

The language imposed by the Incas further diverted from its original phonetic tone as some societies formed their own regional varieties, or slang. The diversity of Quechua at that point and even today does not come as a direct result from the Incas, who are just a part of the reason for Quechua's diversity. The civilizations within the empire that had previously spoken Quechua kept their own variety distinct to the Quechua the Incas spread. Although these dialects of Quechua have a similar linguistic structure, they differ according to the region in which they are spoken. Although most of the societies within the empire implemented Quechua into their lives, the Incas allowed several societies to keep their old languages such as Aymara, which still remains a spoken language in contemporary Bolivia where it is the primary indigenous language and various regions of South America surrounding Bolivia. The linguistic body of the Inca Empire was thus largely varied, but it still remains quite an achievement for the Incas that went even beyond their times as the Spanish imposed the use of Spanish as a method to force their culture upon the indigenous peoples of South America.