Oy or OY may refer to:
Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats.
The Oyster card is a form of electronic ticket used on public transport in Greater London in the United Kingdom.
The Oyo Empire was a Yoruba empire of what is today Western and North central Nigeria, . Established in the 15th century, the Oyo Empire grew to become one of the largest West African states.
The Town of Oyster Bay is easternmost of the three towns in Nassau County, New York, in the United States.
Oymyakon (Russian: Оймяко́н, pronounced [ɐjmʲɪˈkon]; Yakut: Өймөкөөн, Öymököön, IPA: [øjmøˈkøːn]) is a rural locality (a selo) in Oymyakonsky District of the Sakha Republic, Russia, located along the Indigirka River, 30 kilometers (19 mi) northwest of Tomtor on the Kolyma Highway.
The Oyster Bay History Walk is a path through downtown Oyster Bay, New York that leads the walker to 30 historic sites.
Oyster Bay is a hamlet and census-designated place (CDP) on the North Shore of Long Island in Nassau County in the state of New York, United States.
Ọyọ, usually referred to as Oyo State to distinguish it from the city of Oyo, is an inland state in south-western Nigeria, with its capital at Ibadan.
The Oyu Tolgoi mine (Mongolian: Оюу Толгой, also Oyu Tolgoi, Turquoise Hill) is a combined open pit and underground mining project in Khanbogd sum within the south Gobi Desert, approximately 235 kilometres (146 mi) east of the Ömnögovi Province capital Dalanzadgad.