The Swaminarayan Mantra is the main mantra of the Swaminarayan sect. The word "Swaminarayan" is repeated by adherents of the faith when praying, classifying it as a mantra.
History
In the year 1801, a fortnight after the death of his guru, Ramanand Swami, Swaminarayan (then known as Sahajanand Swami) held a gathering in Faneni. It was there that he explained the meaning of Swaminarayan. It was there he announced that whoever chanted the name Swaminarayan with love and faith, would be able to realize his objective. It is believed that whoever chants this mantra will be redeemed of material desires.
References
Swaminarayan Mantra Wikipedia(Text) CC BY-SA