Auguste-Henri-Victor Grandjean de Montigny (15 July 1776 – 2 March 1850) was a French architect who had considerable influence on the development of architecture in Brazil.

[1] He moved to Brazil in 1816 at the invitation of King John VI of Portugal (1816–26), who wanted to improve the cultural level of the colony.

He represented architecture among the French artistic colony organized and led by Joachim Lebreton, who created the Academy of Fine Arts in Rio.

[9] He designed official and private buildings, including residences in Rio de Janeiro in the Passeio, Mariz e Barros, Haddock Lobo and Catumbi streets.

[3] In 1829 he was responsible for all the decorations for the festival celebrating the marriage of the Emperor Pedro I of Brazil and the Empress Amélie of Leuchtenberg.