A floating island is a mass of floating aquatic plants, mud, and peat.

Floating island may also refer to:

• Very large floating structure, a real or fictional artificial floating "island"
• Floating island (fiction), the concept in fiction
• Floating island (dessert), a French dessert
• The Floating Island (Head novel), a 1673 novel by Richard Head
• Floating Island (novel), a 1930 novel by Anne Parrish
• The Floating Island (Haydon novel), a 2006 novel by Elizabeth Haydon
• The "Floating Island" or "Angel Island," a recurring location in the Sonic the Hedgehog series
• Floating islands (Bingöl), mass of floating aquatic plants in the form of islands on a lake in Bingöl Province, Turkey
• Floating Islands (album), an album by Lotte Anker