Tavşan Adası ("Rabbit Island" in Turkish) (Greek: Neandros (Νέανδρος), the name of a mythological figure.) or Balıkçı Adası is the smallest of the Princes' Islands in the Sea of Marmara, to the southeast of Istanbul, Turkey. It is under the administration of the Adalar (literally Islands or Isles) district of Istanbul Province. The island has an area of .
On 10 April 2021, it was declared as a protected vulnerable marine area through a presidential decree.[1]