Ratan Lal Brahmachary ( Bengali: [Ratana lāla brahmacārī])(1932 - 13 February 2018) was a distinguished biochemist and a pioneer of tiger pheromone studies in India. He was widely known for his research in pheromones, although his academic background based on Physics, specifically on astrophysics under guidance of S.N. Bose. Brahmachary made significant contributions in tiger behavioral studies researching the animal for over 50 years. He studied many species of wildlife, notably big cats and undertook research trips to his favourite continent Africa fourteen times. Brahmachary studied ethology in the Amazon basin in South America and Borneo, Indonesia with an ardent admirer of entomologist Gopal Chandra Bhattacharya.