Lutte Ouvrière ("Workers' Struggle"; French: [lyt uvʁijɛʁ]) is a Trotskyist communist party[2] in France, named after its weekly paper.

An ongoing issue is the possibility and conditions of cooperation with fellow Trotskyist party the Revolutionary Communist League, the French section of the Fourth International.

Another more recent breakaway developed after Arlette Laguiller's relatively high electoral results in the 1990s and LO's statement that this meant that a new workers' party was a possibility.

While considering the law as hypocrite, LO stated that "For teachers, not accepting hijab, - particularly in the classroom, - means to support women in their family and social environment, attempting to resist the machismo".

Following the very low score of Arlette Laguiller in the first round of the April–May 2007 presidential election (1,33%, compared to 5,72% in 2002), the party was left with a debt of €1.4 million.

For the 2022 French legislative election, LO announced that the party would run its own slate separate from the New Ecologic and Social People's Union, which they believe to be reformist.

The 2012 presidential candidate, Nathalie Arthaud, is a teacher and was an elected town councillor for Vaulx-en-Velin, in charge of youth matters.

Arlette Laguiller had first run as the LO candidate in 1974, and subsequently in 1981, 1988, 1995, 2002, with 2007 being her last candidacy, and still plays an active part in the leadership of the party.

Bernard Seytre, a member of LO for 20 years, confirmed the "iron discipline which rhythms the life of this Trotskyist organisation, whose responsibles [cadres] do not have the right to have children, lest they be excluded".

[13][14] In part, this strict disciplinary attitude has enabled LO to be a very stable organisation in contrast to the instability that they allege characterises so many other left groups.

LO is a difficult organisation to actually join and after becoming a member, individuals are expected to conform to a code of conduct, which is considered old fashioned by some critics.