St. John's Island or St. John Island may refer to:
- Saint John, U.S. Virgin Islands, an island of the U.S. Virgin Islands
- Saint John's Island, Singapore
- St. John's Island, Canada, former name of Prince Edward Island to 1798
- St. John's Island, Egypt
- Shangchuan Island or Saint John Island, China, originally from São João ("Saint John" in Portuguese)
- St. Ivan Island, in Bulgaria (Ivan is the Bulgarian name corresponding to John)
This disambiguation page lists articles about distinct geographical locations with the same name.
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