The Chaplet of the Divine Mercy, also called the Divine Mercy Chaplet, is a Christian devotion to the Divine Mercy, based on the Christological apparitions of Jesus reported by Saint Faustina Kowalska.

On September 13, 1935, while Faustina was in Vilnius, she wrote of a vision of Jesus about the chaplet in her diary . Faustina stated that Jesus asked her to pray the chaplet and instruct others to do so. Although the chaplet is said on beads like the Rosary, it is about a third of the length of the Rosary, and unlike the Rosary that has evolved over the years, the form and structure of the chaplet has remained unchanged since Faustina attributed it to a message from Jesus.

According to Faustina's visions, written in her diary, the chaplet's prayers for mercy are threefold: to obtain mercy, to trust in Christ's mercy, and to show mercy to others.Faustina wrote that Jesus promised that all who recite this chaplet at the hour of death or in the presence of the dying will receive great mercy. She wrote that Jesus said:

"....When they say this Chaplet in the presence of the dying, I will stand between My Father and the dying not as the just judge but as the Merciful Savior."