芒特迪瑟特岛是美国的岛屿，位于大西洋海域，由缅因州负责管辖，长24公里、宽13公里，面积280平方公里，最高点海拔高度466米，2000年人口10,424。

Mount Desert Island (often abbreviated MDI), in Hancock County, Maine, is the largest island off the coast of Maine. With an area of 108 square miles (280 km) it is the 6th largest island in the contiguous United States. It is the second-largest island on the Eastern seaboard, behind Long Island and ahead of Martha's Vineyard. According to the 2010 census, the island has a year-round population of 10,615, although it is estimated that two and a half million tourists a year visit Acadia National Park on the island. The island is home to numerous well-known summer colonies such as Northeast Harbor and Bar Harbor. Current notable summer residents include George Mitchell, Tim Robbins, David Rockefeller, Susan Sarandon, and Martha Stewart.