Cursillos in Christianity (in Spanish: Cursillos de Cristiandad, short course of Christianity) is a ministry that began in the Roman Catholic Church and has since spread to other Christian denominations. It was founded in Majorca, Spain by a group of laymen in 1944, while they were refining a technique to train pilgrimage leaders. It has since been adapted by numerous other Christian denominations, some of which have retained the name "cursillo" while others have given the program a different name.
The cursillo method focuses on training lay people to become effective leaders over the course of a three-day weekend. The weekend includes fifteen talks, some given by priests and some by lay people. One emphasis of the weekend is on preparing those undergoing it to take the movement's methods back into the world, on what they call the "fourth day".