Novikov Mansion, Federal cultural heritage mansion in Zelenogorsk, Russia.

The Novikov Mansion is a two-storey Jugendstil villa at 6 Ispolkomovskaya Street in Zelenogorsk, on a 1.15-hectare plot about a kilometre from the Gulf of Finland. Its architect is unknown. The estate also includes a two-storey service building, a sauna and pool wing, a greenhouse, a granite basin pavilion, cast-iron gates, an icehouse and a park; all seven listed structures are now ruined.

Provincial secretary Ivan Novikov, a State Noble Land Bank employee in St. Petersburg, bought two plots in Terijoki's Keskikylä in 1913 and had the villa built in 1914. In October 1917 it passed to businessman Ivan Lassmann, and in 1927 pharmacist Uno Hagberg acquired it. After his bankruptcy, Lieutenant Colonel Hjalmar Siilasvuo bought it for the Finnish Defence Forces and established the officers' club of Bicycle Battalion 1 there. During the Winter War it housed the Terijoki government under Otto Wille Kuusinen.

The mansion's name comes from Ivan Novikov, a provincial secretary at the State Noble Land Bank in St. Petersburg who bought two plots in Terijoki's Keskikylä district and had the villa built in 1914. After Finnish independence it became the Terijoki Officers' Club, and during the Winter War the Terijoki government of the Finnish Democratic Republic met here. The architect of the Jugendstil building is unknown.

The mansion is accessible on foot and can be viewed from outside to study the facade details and building design. Visitors should look at the surrounding streets to understand how this architecture relates to other buildings from the same era.

The mansion's architect is unknown, though the two-storey building is classed as Jugendstil. The estate also held a greenhouse, an ice cellar, a cast-iron gate and a granite pool pavilion; all seven listed structures were ruinous before restoration work began in 2013 and finished in 2021.