The Diocese of Helsinki (Finnish: Helsingin hiippakunta; Swedish: Helsingfors stift) is a diocese of the Evangelical Lutheran Church of Finland, and the seat of the Bishop of Helsinki.

It was partitioned again in 2002, when the western part became the Diocese of Espoo.

The current bishop of Helsinki is Teemu Laajasalo.

In the Kallio and Vallila districts, church membership among the residents is circa 49 per cent.

Only in six of the 18 parishes of the diocese the membership share reaches over 60 per cent of the population.