This study explores the evolution of linguistic and narrative styles in Indian English novels, reflecting the socio-cultural transformations of postcolonial India. Employing thematic analysis through Leximancer and linguistic pattern analysis via NVivo, the research analyzed novels from the 1950s to the present. The findings reveal a significant shift from the formal, British-influenced English of the early post-independence period to a more colloquial and Indianized form in contemporary times. This linguistic evolution includes the incorporation of local dialects, Indian idioms, and a narrative style resonant with India's oral storytelling traditions. The study also identifies a thematic progression from colonial struggles to issues of globalization, urbanization, and modern societal conflicts. Narratively, there has been a transition from linear, conventional storytelling to complex, non-linear narratives with multiple perspectives, mirroring the complexities of modern Indian life. These shifts in Indian English novels are not only stylistic but also reflect deeper socio-cultural and political dynamics. This research contributes to the broader understanding of postcolonial literature and its role in cultural and societal representation.