Niranjanananda (Senior), born as Nitya Niranjan Ghosh, was a prominent monk of the Ramakrishna Mission and one of the direct monastic disciples of Ramakrishna. He was considered an "Nityasiddha" or "Ishwarakoti," a soul who is ever perfect. Niranjanananda made significant contributions to spiritual and philanthropic activities during his short life.

Born in Rajarhat-Bishnupur in the 24 Paraganas district of Bengal, Niranjanananda had an early association with a group of spiritualists and was recognized as a successful medium. When he met Ramakrishna for the first time, the latter advised him to focus on God instead of spiritualism. Niranjanananda continued his association with Ramakrishna and demonstrated his devotion by taking up the role of a gatekeeper during Ramakrishna's illness. He also played a part in resolving disputes among Ramakrishna's disciples regarding the ownership of relics after the master's death.

Niranjanananda took his monastic vows in 1887 and resided at the Baranagar Math, the first monastery of the Ramakrishna Order. He actively engaged in laborious tasks and undertook various pilgrimages, spreading the teachings of his master. He accompanied Swami Vivekananda on his travels across India and initiated disciples along the way. Niranjanananda held Sarada Devi, Ramakrishna's wife, in high esteem and cared for her during her periods of depression.

Described as an ever pure soul by Ramakrishna, Niranjanananda was known for his simplicity, truthfulness, purity, fearlessness, and renunciation. He actively participated in philanthropic and charitable work, particularly at the behest of Vivekananda. Niranjanananda established the Sevashrama, also known as the Ramakrishna Mission Home of Service, in Varanasi, inspiring young men to renounce worldly life and serve the poor. He emphasized service to others and had unwavering faith in the doctrine of service.