According to the Book of Mormon, Omni () is the first writer of several authors of the Book of Omni, and the son of Jarom. It is believed that he was born in 390 BC. Omni wrote the first three verses of the Book of Omni before passing the responsibility of keeping the Book of Mormon record to his son, Amaron. His writings are shown below:
Behold, it came to pass that I, Omni, being commanded by my father, Jarom, that I should write somewhat upon these plates, to preserve our genealogy—
Wherefore, in my days, I would that ye should know that I fought much with the sword to preserve my people, the Nephites, from falling into the hands of their enemies, the Lamanites.