Kartik Chandran is an American environmental engineer and professor in the Department of Earth and Environmental Engineering at Columbia University. His research focuses on the intersection of environmental molecular microbiology, biotechnology and engineering, particularly in elucidating the molecular microbial ecology and metabolic pathways of the nitrogen cycle. Applications of his work include energy-efficient treatment of nitrogen-containing wastewater, sustainable sanitation approaches, and innovative models for resource recovery. Under his leadership, Columbia University established its first programs for resource recovery of biological wastewater treatment and biological nutrient removal were established for the first ever time in the history of Columbia University.