St. John's Island

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)