Niyaz Ahmed's research interests constitute analyzing trends in genomic diversity of bacterial pathogens with reference to evolution of survival mechanisms, metabolic machinery and virulence apparatuses etc. and their impact on dissemination dynamics, invasion, persistence, signaling events, molecular pathogenesis, strain evolution and prevention measures.

His group analyzes pathogen behavior through decipherment of genomic and proteomic diversity as a function of flexibility in gene content (plasticity zones, large deletions), gene order (transposition), and gene regulation (allelic variation, synonymous substitutions, strand displacements), possibly aimed at evolution of fittest genotypes, corresponding to changing host niches and the environment.

He is currently studying global diversity and evolution of two important pathogens, viz, M. tuberculosis and Helicobacter pylori. Another important pathogen of recent interest is Leptospira interrogans where the research theme is - how a saprophytic organism evolves into a deadly human pathogen?

He is an elected member of the National Academy of Sciences, India.