Aligarh Muslim University (AMU) has a key role in the development of Urdu language and literature since its inception. Dr. Abdul Ghaffar Shakeel (1929-2016) was one of those renowned linguists who performed their services at Urdu and Linguistics Department of AMU. This paper presents his linguistic writings with special reference to his two books on language and linguistics named Zaban-o-Masail-e-Zaban (1974) and Lisani-o-Tahqeeqi Mutalay (1975). Language, dialects, beginning of Urdu, Daccani Urdu, linguistic issues and future of language are some of his major linguistic writing areas. Some views related to structuralism and language derived from the concepts of Ferdinand de Saussure (1857-1913) may also be observed in his writings. Furthermore, he focused on the social aspects of language. He also analyzed the development of Daccani Urdu from 1375 to 1746. The language formula comprised of Urdu and Hindi named Hindustani presented by Gandhi was also analyzed by Mr. Shakeel. He is of the view that the two languages are very different from each other especially at literary level. Through this article, his language thoughts have been analyzed on the basis of modern linguistic concepts.