Squam Lake has about 30 named islands and numerous smaller, unnamed islets.

The named islands are:

• Basin Island
• Birch Island
• Bowman Island
• Carnes Island
• Chocorua (Church) Island
• Duck Island
• Great Island
• Groton Island
• High Haith (at 243 acres, the largest island, but only separated from mainland by narrow ditch bridged by road)
• Hoag Island
• Hubble Island
• Kate Island
• Kent Island
• Kimball Island
• Laurel Island
• Little Loon Island (nesting site to bald eagles in 2003, 2005, 2006, 2012)
• Long Island
• Loon Island
• Merrill Island
• Mink Island
• Mooney (or Moon) Island
• Mouse Island
• Otter Island
• Perch Island
• Potato Island
• Sheep Island
• Three Sisters (three separate islands)
• Utopia Island
• Yard Island