Julia Lynch Olin (October 21, 1882 – March 11, 1961) was an American author and Baháʼí who co-founded the New History Society in New York City, and was later expelled from the religion by Shoghi Effendi around 1939.

She was the daughter of Stephen Henry Olin (1847–1925), the acting President of Wesleyan University from 1922 to 1923,[2] and Alice Wadsworth Barlow (1853–1882).

[4][5] After her mother's death in 1882 at the age of 29,[6] her father remarried to Emeline Harriman (1860–1938), the former wife of William Earl Dodge III, in 1903.

Becoming intimately associated with Mirza Ahmad Sohrab they together with her second husband, Lewis Stuyvesant Chanler, started the New History Society.

[12] This Society, based in the home that Olin and Lewis owned in New York, (later called Caravan House), published several books, into the late 1950s.

[19] She was expelled from the Baháʼí community in 1939 along with Lewis and Sohrab after they refused to allow the Local Spiritual Assembly of New York oversight over the operations of the New History Society.

At least one of the winners of this, Jaja Wachuku, became famous in his own right, for his essay "How Can the People of the World Achieve Universal Disarmament?"