Nilmoni may refer to: Nilamani, term for Sapphire in Sanskrit, the blue (nila) gem (mani) Krishna, the Hindu god also known as Nilamani, often depicted as blue skinned Nilmoni Phukan Sr, Assamese writer, poet, freedom fighter and politician Nilmoni Singha Dev, 19th-century Indian monarch Nilmoni Tagore, founder of the Jorasanko branch of Tagore family