Frances Isabelle Parnell (4 September 1848 – 20 July 1882) was an Irish poet and Irish nationalist. She was the sister of Charles Stewart Parnell and Anna Catherine Parnell, important figures in 19th-century Ireland.

Parnell was born on 4 September 1848 in Avondale, County Wicklow, Ireland into a wealthy Protestant background. She was the eighth of eleven children born to John Henry Parnell, a landowner and the grandson of the last Chancellor of the Irish Exchequer, and Delia Tudor Stewart Parnell, an Irish-American and the daughter of Admiral Charles Stewart (1778–1869) of the US Navy. Parnell's mother hated British rule in Ireland, a view presented through her children's works.^[1]

As a child, Parnell studied mathematics, chemistry, and astronomy, and she could fluently speak and write in several European languages. She also had talents in music, painting, and drawing.^{[citation needed]}

Parnell's parents separated when she was young, and soon after her father died in July 1859, she and her mother moved to Dalkey. A year later they moved to Dublin.^[2] In 1865, they moved to Paris to join her mother's brother. Parnell and her mother were still in Paris when the Franco-Prussian War broke out in 1870; they joined the American Ladies’ Committee. They nursed the wounded, and fund-raised for and set up a hospital, including overseeing the purchasing and storing of supplies.^[2]

In 1874, Delia's brother died, and she and Parnell left Paris to return to the family estate in Bordentown, New Jersey in the United States, where Parnell's political career began.^[2]

Parnell was known as the Patriot Poet. She showed interest in Irish politics and much of her poetry was about Irish nationalism. While living in Dublin in 1864, she began publishing her poetry under the pseudonym "Aleria" in The Irish People, the newspaper of the Fenian Brotherhood. Most of her later work was published in The Boston Pilot, the best-known Irish newspaper in the United States during the nineteenth century. Two of her most widely published works were The Hovels of Ireland, a pamphlet, and Land League Songs, a collection of poems. Her best known poem is "Hold the Harvest", which Michael Davitt referred to as the “Marseillaise of the Irish peasant."^[3]

Parnell's brother, Charles, became active in the Land League, an organisation that fought for poor tenant farmers, in 1879 and she strongly supported him. Parnell and her younger Anna co-founded the Ladies' Land League in 1880 to raise money in America for the Land League. In 1881, the Ladies' Land League continued the work of the men in the Land League while they were imprisoned by the British government. In Ireland, Anna became the president of the Ladies' Land League, and the women held many protests and quickly became more radical than the men, to the resentment of the male leaders. Parnell stayed in the United States and worked to raise money for the organisation. Most of the Land League's financial support came from the United States because of the campaigning done by Parnell.

Parnell died on 20 July 1882, at the age of 33, of a heart attack at the family mansion in Bordentown, New Jersey. She was buried at the Tudor family plot at Mount Auburn Cemetery in Cambridge, Massachusetts.^[6] At the time of her death, Parnell was survived by her mother, three brothers, and four sisters.^[7]