Helsinki Cathedral is the Finnish Evangelical Lutheran cathedral of the Diocese of Helsinki, located in the neighborhood of Kruununhaka in the centre of Helsinki, Finland, at the Senate Square. The church was originally built from 1830 to 1852 as a tribute to the Grand Duke of Finland, Tsar Nicolas I. It was also known as St Nicholas's Church until Finland declared its full independence in 1917. It is a major landmark of the city, and one of the most famous historical structures in Finland as a whole when viewed globally.

Carl Timoleon von Neff, also russified from 1844 as Timofey Andreyevich Neff was a Russian Imperial artist of Baltic German descent.