Konstantin Andreyevich Thon, also spelled Ton was an official architect of Imperial Russia during the reign of Nicholas I. His major works include the Cathedral of Christ the Saviour, the Grand Kremlin Palace and the Kremlin Armoury in Moscow.

The Cathedral of Christ the Saviour is a Russian Orthodox cathedral in Moscow, Russia, on the northern bank of the Moskva River, a few hundred metres southwest of the Kremlin. With an overall height of 103 metres (338 ft), it is the third tallest Orthodox Christian church building in the world, after the People's Salvation Cathedral in Bucharest, Romania and Saints Peter and Paul Cathedral in Saint Petersburg, Russia.