Rat Island

Rat Island may refer to:


 * Ilha dos Ratos, the original name for Ilha Fiscal in Rio de Janeiro, Brasil
 * Hawadax Island, Alaska, USA, formerly known as "Rat Island"
 * Rat Island, New York, USA
 * Rat Island (Houtman Abrolhos), an island in Western Australia
 * An alternative name for Burrow Island in Portsmouth Harbour, Hampshire, England
 * Motukiore, Bay of Islands, New Zealand
 * Rat Island, Lundy, a small island near the south end of Lundy, Devon, England
 * Rat Island: a small island west of Bengkulu (19th Century name)
 * Rat Island, St Lucia, St Lucia