This research paper meticulously traces the evolution of Islamic tomb architecture in India, from its early manifestations to the zenith embodied by the Taj Mahal. Beginning with the construction of the Tomb of Nasir-ud-Din Muhammad (Sultan Ghari) in A.D. 1231, attributed to Shams- ud-Din Iltutmish, the paper unveils the genesis of tomb architecture in India, with distinct elements reflecting Hindu influence. The exploration progresses to Iltutmish's innovative phase, exemplified by the Tomb of Shams-ud-Din Iltutmish (A.D. 1235), strategically positioned near the Quwwat-ul-Islam mosque. The introduction of the 'squinch' technique exemplifies a pioneering quest for dome construction techniques during this phase. The Tughlaqs' experimental era, witnessed through Ghias ud Din Tughlaq and Firuz Shah Tughlaq's tombs, reveals challenges in achieving widespread appeal due to stunted domes. The Lodis then emerge as pioneers with Sikandar Lodi's Tomb, introducing typological differentiations with octagonal and square plans, catering to distinct societal strata. Key innovations, such as the introduction of the double dome seen in Shihab-ud-din-Taj's tomb and Sikandar Lodi's tomb, become pivotal architectural features, addressing challenges of height and proportions. Regional variations, as seen in the Eklakhi Tomb in Bengal, Ibrahim Rauza reflecting Bahamani style, and Golgumbaz's remarkable square plan, underscore the impact of climatic considerations and regional aesthetics. Culminating in the Taj Mahal, the paper meticulously dissects its architectural features, showcasing the intricate layout, translucent white marble, and innovative use of a double dome. This exploration provides a comprehensive understanding of the cultural, technological, and artistic tapestry that defines Islamic tomb architecture in India. Key Words: Islamic Tomb Architecture, Taj Mahal, Double Dome, Regional Variations