Victor Alexandrovich Nilsen (Russian: Виктор Александрович Нильсен, born in 1871 in Saint Petersburg ; died in 1949 in Dushanbe) was an engineer, city architect of Mariupol from 1901 to 1917 and publicist and a deputy in the Mariupol Duma (city council).

He began to work as an architect and engineer in the city of Rybinsk on the Volga.

The architect Victor Nilsen designed and built the Saints Constantine and Helen Church between 1903 and 1911.

[8][9] The city architect dedicated this building to his daughter, who died of typhoid fever.

In addition, he designed and built in 1911 the eparchial school (now Pryazovskyi State Technical University) .