Isabel Frances Longworth (1 June 1881 – 13 January 1961) was an Australian dentist and peace activist.

Born Isabel Frances Swann in Temora

Temora, New South Wales

Temora is a town located in north east part of the Riverina area of New South Wales, south-west of the state capital, Sydney. At the 2006 census the population of Temora was 4,086.-History:...

, she was the daughter of English-born schoolteacher William Swann and Elizabeth, née Devlin. Isabel was registered as a dentist on 20 June 1902 and began practising at Parramatta

Parramatta, New South Wales

Parramatta is a suburb of Sydney, in the state of New South Wales, Australia. It is located in Greater Western Sydney west of the Sydney central business district on the banks of the Parramatta River. Parramatta is the administrative seat of the Local Government Area of the City of Parramatta...

; by 1912 she had an address on Liverpool Street. Brought up in a pacifist family, her patients included Miles Franklin

Miles Franklin

Stella Maria Sarah Miles Franklin, known as Miles Franklin was an Australian writer and feminist who is best known for her novel My Brilliant Career, published in 1901...

, Jennie Scott Griffiths and others, and she joined the Australian Freedom League in 1912. She was a militant anti-conscription

Conscription

Conscription is the compulsory enlistment of people in some sort of national service, most often military service. Conscription dates back to antiquity and continues in some countries to the present day under various names...

ist who was disappointed with the attitude taken by Rose Scott

Rose Scott

Rose Scott was an Australian women's rights activist who protested for women's suffrage and universal suffrage in New South Wales at the turn-of-the twentieth century .-Early life:...

 and her supporters, who Swann saw as advocating war in the name of defence.

In the late 1910s Swann was a speaker at Socialist Sunday Schools and became involved in a number of controversial causes, including opposition to saluting the flag in schools and the Howard Prison Reform League. A correspondent of Henry Holland

Henry Holland

Henry Holland may refer to:* Henry Holland, 3rd Duke of Exeter , Lancastrian leader during the Wars of the Roses* Henry Holland , English writer on witchcraft...

, she claimed partial responsibility for ending indentured labour in Fiji

Fiji

Fiji , officially the Republic of Fiji , is an island nation in Melanesia in the South Pacific Ocean about northeast of New Zealand's North Island...

 as part of the Anglo-Indian committee. She hid New Guinea

New Guinea

New Guinea is the world's second largest island, after Greenland, covering a land area of 786,000 km2. Located in the southwest Pacific Ocean, it lies geographically to the east of the Malay Archipelago, with which it is sometimes included as part of a greater Indo-Australian Archipelago...

n natives in Sydney until their shipboard conditions improved and represented the Women's International League for Peace and Freedom at the Australian Peace Alliance conference in 1921.

On 23 August 1924 she married William Longworth, a grinder, at Randwick

Randwick, New South Wales

Randwick is a suburb in south-eastern Sydney, in the state of New South Wales, Australia. Randwick is located 6 kilometres south-east of the Sydney central business district and is the administrative centre for the local government area of the City of Randwick...

; they would have one daughter. The family moved to Wyong

Wyong, New South Wales

Wyong was proclaimed a town in 1888 and is currently a major northern suburb of the Central Coast region of New South Wales, located approximately 89 km NNE of Sydney. It is the administrative centre for the Wyong Shire local government area.- History :...

 in 1932 where they attempted to grow passionfruit commercially, and then to Newcastle

Newcastle, New South Wales

The Newcastle metropolitan area is the second most populated area in the Australian state of New South Wales and includes most of the Newcastle and Lake Macquarie Local Government Areas...

 in 1936. She helped organise a peace conference with the Christian Socialist Movement, where she argued against fascism

Fascism

Fascism is a radical authoritarian nationalist political ideology. Fascists seek to rejuvenate their nation based on commitment to the national community as an organic entity, in which individuals are bound together in national identity by suprapersonal connections of ancestry, culture, and blood...

. A supporter of the Soviet Union

Soviet Union

The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

, Longworth unsuccessfully contested the House of Representatives

Australian House of Representatives

The House of Representatives is one of the two houses of the Parliament of Australia; it is the lower house; the upper house is the Senate. Members of Parliament serve for terms of approximately three years....

 seats of Newcastle

Division of Newcastle

The Division of Newcastle is an Australian Electoral Division in the state of New South Wales. The Division is centred around the city of Newcastle, after which it is named....

 (1946) and Shortland

Division of Shortland

The Division of Shortland is an Australian Electoral Division in the state of New South Wales. The Division closely follows the Pacific coast, on average extending only five or ten kilometres inland. Much of the western boundary is formed by Lake Macquarie...

 (1949) as an Independent Scientific Socialist. At the age of 78, she was recognised as the longest-practising dentist in Australia.

Longworth died in 1961 at Newcastle and was cremated with Congregational forms.