The "Alliance of the Hearts of Jesus and Mary" is a phrase coined by Pope John Paul II during his Angelus Address of September 15, 1985. Discussing devotion to the Sacred Heart of Jesus and the Immaculate Heart of Mary, he said that "...though distinct, they are interrelated by reason of the enduring relation of love that exists between the Son and his Mother." Subsequently, several symposia were held to examine its roots and implications. Since there had already been much research on Devotion to the Sacred Heart, the conferences tended to focus on the devotion to the Immaculate Heart of Mary from the perspective of Sacred Scripture and Tradition.

The Immaculate Heart of Mary is a Roman Catholic devotion which refers to the view of the interior life of Mary, her joys and sorrows, her virtues and hidden perfections, and, above all, her virginal love for God the Father, her maternal love for her son Jesus Christ, and her motherly and compassionate love for all mankind. Traditionally, the Immaculate Heart is depicted pierced with seven swords or wounds, in homage to the seven dolors of Mary and roses, usually red or white, wrapped around the heart.