Nidderau (German: [ˈnɪdɐʔaʊ] ^ⓘ, lit. 'Nidder meadow') is a town in the Main-Kinzig district, in Hesse, Germany. It is situated approximately 12 km north of Hanau, and 20 km northeast of Frankfurt. Nidderau was created in the merger of the municipality of Heldenbergen with the town of Windecken on January 1, 1970. Eichen and Erbstadt joined Nidderau on January 1, 1972 and Ostheim merged with Nidderau in July 1974.