The Boryeong Mud Festival is an annual festival which takes place during the summer in Boryeong, a town around 200 km south of Seoul, South Korea. The first Mud Festival was staged in 1998 and, by 2007, the festival attracted 2.2 million visitors to Boryeong.

In 1997 a range of cosmetics was produced using mud from the Boryeong mud flats. The clothes were said to be full of minerals, bentonites, and germaniums, all of which occur naturally in the mud from the area.

In order to promote these cosmetics, the Boryeong Mud Festival was conceived. Through this festival, it was hoped people would learn more about the mud and the cosmetics.