Herttoniemi (Swedish: Hertonäs; unofficial English translation based on the historic meaning of the name: "Duke Cape") is a neighbourhood and a suburb of Helsinki, the Finnish capital. It is located about 7 km east of the city centre and can be easily reached by metro in 10 minutes. It has an older northern suburb and a newer coastal suburb with ferry connections to the city centre. There once was a large harbour in Herttoniemi, but in the 1990s, this industrial harbour area was demolished and converted to a tightly populated residential area and marina.
There are four districts in Herttoniemi: