Léa Roback (3 November 1903[1] – 28 August 2000) was a Canadian trade union organizer,[2] social activist, pacifist, and feminist.

Born in Montreal, Quebec, on Guilbault Street in 1903, the second of nine children,[4] she was the daughter of Polish Jewish immigrants.

Interested in literature, she saved money to enroll at the University of Grenoble in 1926,[5] earning a Bachelor of Arts degree.

She felt seduced by the socialists, but she believed they did not put their words into action, hence she shifted her support to Marxism-Leninism.

Roback was a political organizer for Fred Rose's ultimately successful campaign in the 1943 Cartier by-election.

[5] After steadily distancing herself from the CPC, Roback left the party in 1958 after the Soviet invasion of Hungary.

[3][8] In 1960, she became a member and played an active role in the organization "Voice of Women" (La Voix des Femmes in Montreal)[5] alongside Madeleine Parent, Thérèse Casgrain, and Simonne Monet-Chartrand.

She denounced the Vietnam War and apartheid in South Africa, campaigned against the proliferation of nuclear weapons, and was a proponent of free access to a quality education.

In September 2023, Roback was one of three Quebec feminists and trade unionists, along with Madeleine Parent and Simonne Monet-Chartrand, honoured by Canada Post with a postage stamp.