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Ridder (Kazakh and Russian: Риддер), formerly known as Leninogorsk (Russian: Лениногорск, 1941–2002) is a city in the East Kazakhstan Province in north-eastern Kazakhstan. Population: 50,500 (2009 Census results).
Ridder was founded in 1786, receiving the rights of a town in 1934. Until 1941 it carried its present name, named after Philip Ridder who discovered the local ore deposits. In 1941 the town was renamed Leninogorsk, in 2002 it once more received its old name of Ridder.
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