Ostankino Tower (Russian: Останкинская телебашня, Ostankinskaya telebashnya) is a television and radio tower in Moscow, Russia, owned by the Moscow branch of unitary enterprise Russian TV and Radio Broadcasting Network.

Standing 540.1 metres (1,772 ft), Ostankino was designed by Nikolai Nikitin. It is currently the tallest free-standing structure in Europe and 11th tallest in the world.

Between 1967 and 1974, it was the tallest in the world. The tower was the first free-standing structure to exceed 500 m (1,600 ft) in height. Ostankino was built to mark the 50th anniversary of the October Revolution. It is named after the surrounding Ostankino district of Moscow.

Construction began in 1963 and was completed in 1967.

Extensive use of prestressed concrete resulted in a simple and sturdy structure. It surpassed the Empire State Building to become the tallest free-standing structure in the world. It held this record for eight years until it was overtaken by the CN Tower in Toronto, Canada in 1975, which surpassed its height by 13 metres (43 ft). The Ostankino Tower remained the second-tallest free-standing structure in the world for another 32 years until the Burj Khalifa surpassed both it and the CN Tower in height in 2007. The Ostankino Tower has remained the tallest structure in Europe for over 50 years.

A 1994 plan to increase the tower's height to 561 metres (1,841 ft) by adding an antenna was not implemented due to the lack of funding.