Tehtaankatu (Swedish: Fabriksgatan) is an east-to-west street in southern central Helsinki.
It leads from the border of Kaivopuisto park near South Harbour to Hietalahti shipyard.
Most of the street is in Ullanlinna district, but its westernmost part forms the border between Eira and Punavuori districts.
Since the end of the Second World War, the Soviet and later Russian embassy has been located on Tehtaankatu, and the name of the street has been commonly used as shorthand for Russian influence in Finland, especially during the Soviet era.
The names were given to the street in 1887, because at that time an industrial zone was planned at the area which is now Eira.