Caltha leptosepala (White Marsh Marigold, Twinflowered Marsh Marigold, or Broadleaved Marsh Marigold) is a species of flowering plant in the buttercup family. It is native to western North America from Alaska to New Mexico, where it grows in wet mountain habitats in alpine and subalpine regions. There are two general wild types of this species, one native to the interior and one that grows along the Pacific coast and coastal mountains, but these are not always treated separately.