Mary Jo Leddy, CM (born 1 February 1946) is a Canadian writer, speaker, theologian and social activist.
Leddy is widely recognized for her work with refugees at Toronto's Romero House.
She is the author of the books "Say to the Darkness We Beg to Differ" (Lester and Orpen Denys, finalist City of Toronto Book Award), Reweaving Religious Life: Beyond the Liberal Model (Twenty Third Publications, 1990), At the Border Called Hope: Where Refugees are Neighbours (HarperCollins, 1997 and finalist for the Trillium Award, Radical Gratitude (Orbis Books, 2002), "Our Friendly Local Terrorist" (Between the Lines 2010) and "The Other Face of God: When the Stranger Calls Us Home" (Orbis 2011).
A Meditation on Canada" (Novalis 2019) Leddy was the recipient of a Ph.D. in philosophy from the University of Toronto with a thesis titled "The Event of the Holocaust and the Philosophical Reflections of Hannah Arendt."
After some years as a member of the Roman Catholic Sisters of Our Lady of Sion, she began working for a welcome house for refugees in 1991.