Linnanmäki (Swedish: Borgbacken, colloquially Lintsi, literal translation Castle Hill) is an amusement park in Helsinki, Finland. It was opened on May 27, 1950 and is owned by non-profit Lasten Päivän Säätiö (Children's Day Foundation). Linnanmäki has 44 different rides of different sizes. It also has other attractions, such as arcades, games, kiosks, restaurants and an outdoor stage on which different performers appear in the summer.
In 2007 Linnanmäki had 1.2 million visitors.