The Andaman day gecko (Phelsuma andamanensis), also known as the Andaman Islands day gecko, is a species of gecko in the genus Phelsuma. It is endemic to the Andaman Islands of India, and has recently been introduced to the Nicobar islands. It is a small, slender lizard, has a bright green colour and feeds on insects. Its range is nearly 5000 km away from the centre of the distribution area of the genus Phelsuma, in Mauritius and Madagascar.