Also known as White Sunday, Quasimodo Sunday, Alb Sunday, and Antipascha Sunday, Low Sunday is the Sunday after Easter. It is called Low Sunday because its occurrence is unimportant after the climax of Easter. People often wore white garments on this day (hence "White" and "Alb" Sunday). Quasimodo means "semi-formed" and Antipascha means "after the lamb".

Since 1970, this Sunday has been officially known as the Second Sunday of Easter (that is to say, the Easter season) in the Roman Catholic Church.

This Sunday is apparently known as Quasimodo Sunday because the traditional Introit for this day begins Quasi modo geniti infantes (As newborn babes), from the First Epistle of Peter.

In the Eastern Orthodox Church, the first Sunday after Pascha (Easter) is called Thomas Sunday, after the Gospel passage read that day which recounts the story of Christ appearing to St. Thomas in order to dispel his doubt about the Resurrection.