The death of a woman in the Canberra suburb of Kingston overnight is being treated as suspicious by ACT police.

Police were called just before 2:00am on Friday to a waterfront apartment in Eastlake Parade by ACT ambulance officers who had attended the scene.

They found a 29-year-old woman dead.

Officers said a 31-year-old man was assisting them with their investigation.

Superintendent Cath Grassick said investigations were ongoing and no charges have yet been laid. ( ABC News: James Fettes )

Superintendent Cath Grassick confirmed that the man and woman knew each other but would not provide further detail on their relationship.

Detectives and forensics officers are still at the scene at apartment building 45, on the corner of Eastlake Parade and Eyre Street.

Superintendent Grassick said witnesses were being spoken to by police.

The building is a very new part of the Kingston Foreshore complex on the shores of Lake Burley Griffin, known for its waterfront restaurants and high-end apartments.

Residents only moved into the building late last year and the restaurants on the ground floor of the apartment block have only just opened.

Anyone who may have seen or heard anything suspicious near Eastlake Parade about 1:30am was urged to contact Crime Stoppers on 1800 333 000.