Black Sea Biosphere Reserve, Nature reserve on the Black Sea coast, Ukraine.

The Black Sea Biosphere Reserve is a large protected area along the northwestern coast of the Black Sea, featuring a network of coastal spits, bays, and shallow water zones. The reserve comprises several interconnected natural areas that together form one of the region's most important breeding and stopover sites for water birds.

Created on 14 July 1927 by decree of the Council of People's Commissars of the Ukrainian SSR to protect wintering, migrating and nesting birds. It became an independent research institution in 1933, gained biosphere reserve status in 1984, and joined UNESCO's World Network of Biosphere Reserves. In 2006 the Kherson regional council enlarged it by almost 21,000 hectares.

The reserve's name comes from the Black Sea, whose Tendrov and Yahorlyk bays it protects. Its core is the Yahorlyk Ornithological Sanctuary, a state-level reserve within the site. The administration sits in Hola Prystan, and the reserve belongs to the National Academy of Sciences of Ukraine.

The reserve is not open to casual visitors: entry is limited and arranged through the administration in Hola Prystan. Observation is mostly from outside the protected zones, along the shores of Tendrivska and Yahorlyk bays. The climate is dry and continental, with a mean annual temperature of 10.8 °C, so bring water and sun protection.

The reserve's Tendra and Yahorlyk bays hold more than 120,000 wintering birds, and the coastal-island complex concentrates 60–70% of all seabirds of southern Ukraine. It is the main breeding site of the Mediterranean gull in Europe.