Gunatitanand Swami (28 September 1784 – 11 October 1867), born Mulji Jani, was a paramhansa of the Hindu Swaminarayan Sampradaya who was ordained by Swaminarayan and is accepted as the first spiritual successor of Swaminarayan by the Bochasanwasi Akshar Purushottam Swaminarayan Sanstha (BAPS). Born into a religious family in the small farming community of Bhadra in Gujarat, India, he first received religious education under his father's guru, Ramanand Swami, before encountering Swaminarayan and becoming a swami under him at the age of 25.

For the BAPS, he embodies an essential element of the doctrine of Akshar and Purushottam. They believe, based on interpretation, from the Vachanamrut that "Akshar is an eternally-existing spiritual reality having two forms, the impersonal and the personal". Furthermore, BAPS claims that Gunatitanand Swami was believed to be the first personal manifestation of Akshar in the Guru Parampara: an unbroken line of "perfect devotees" who provide "authentication of office through Gunatitanand Swami and back to Swaminarayan himself". The Vadtal and Ahmedabad dioceses of the Swaminarayan Sampradaya do not subscribe to this theory.

Gunatitanand Swami held various administrative roles, most notably as the mahant of Junagadh mandir, a position he held for forty years. In addition, he was a prominent speaker and was held in high regard as an authority on religious matters in general. A collection of his most important teachings on dharma, knowledge of the atman, detachment, bhakti, and various other matters has been published under the name Swamini Vato. Gunatitanand Swami died in 1867, and a shrine known as the Akshar Deri was built upon the spot his cremation rites were performed.

Gunatitanand Swami was born on 28 September 1784 (Aso Sud Punam, Ashadhi Vikram Samvat 1841) to Bholanath and Sakarba Jani in the village of Bhadra, situated near the river Und in what is now Gujarat, India. His father's guru, Ramanand Swami, named him Mulji. Even from a young age, it was evident that Mulji had a "disinclination towards material objects" and would exhibit a perspicacity that was rare for a child of his age, often claiming while playing with his younger brother Sundarji that he would become a swami and inspire Sundarji to become one. Various accounts indicate a close association between Mulji and Swaminarayan, who was born four years before Mulji. One such incident details how a thin line of milk appeared on the lips of a murti of "Thakorji", a small metal idol of Swaminarayan, while Mulji was himself drinking a glass of milk. In response to his mother's surprise at this, Mulji had explained, "Mother! Thakorji is always present in my heart. When I eat, Thakorji eats with me".

As Mulji approached adolescence, his sacred thread ceremony was performed on 13 June 1793 in anticipation of his pursuit of a religious education. After this event, Mulji immersed himself in learning about the various religious beliefs that were prevalent in Gujarat at the time. He openly told others that Narayan (God) would eventually visit his village and hence he had no reason to travel to Kashi, as was traditionally done for one who wished to pursue a serious religious education. Mulji began visiting prominent religious personalities and learnt from them the various religious and social nuances associated with each sect. By the time he was in his early teens, he had grasped the principles of Shuddhadvaita from Acharya Gosai Narsinhlalji of the Vaishnav Sampradaya and learnt about the Pranami sect. Ramanand Swami's Bhagvat Dharma appealed to him the most due to its teachings and practices and he accepted him as his first guru.

Mulji would often travel to the village of Shekhpat to visit Ramanand Swami and listen to his religious discourses. He formed a lasting friendship with Lalji Suthar, a native of Shekhpat who shared Mulji's zeal for Ramanand Swami's philosophies and who would later become Nishkulanand Swami, one of Swaminarayan's prominent swami disciples. For a period, they would meet every evening at a small shrine to Shiva on a stepwell in the village of Kiri between their respective villages and discuss various religious matters.

Mulji’s first meeting with Swaminarayan Bhagwan occurred in the village of Piplana. Ramanand Swami invited Mulji and Lalji Suthar amongst others to the Bhagvati Diksha ceremony of Neelkanth Varni (Swaminarayan) to be held on 28 October 1800. Upon seeing Mulji, Neelkanth Varni had remarked, "This Mulji (Gunatitanand Swami) is the incarnation of Akshar Brahman, my abode, and will in the future profusely display by his talk and discourses the greatness of my form."

On subsequent visits to Bhadra (Gunatitanand Swami's hometown) and throughout his association with Gunatitanand Swami, Swaminarayan had alluded to the former's standing as Akshar in the theology of the sect. One such revelation was made to Gunatitanand Swami's mother, Sakarba. Swaminarayan arrived at Mulji's house along with a slew of prominent devotees including Vashrambhai, Dosabhai and Ratnabhai. While speaking about how Mulji had once predicted that Swaminarayan would come to eat at Sakarba's house, Swaminarayan remarked to Sakarba, "Mother you may not be able to understand, but your son Mulji is my divine abode, Akshardham."