Viimsi is a small borough in Harju County, Estonia. It lies about 9 km (6 mi) northeast of the centre of Tallinn, just north of Tallinn's subdistrict Merivälja. It is the administrative centre of Viimsi Parish.
As of the 2021 census, Viimsi had a population of 2,703. Its position near Tallinn places it within the immediate hinterland of the capital.