The Regional State Administrative Agency for Southwestern Finland () was one of the six Regional State Administrative Agencies. The administrative area of the agency consisted of two regions, 9 districts and 77 municipalities.

The operations of the Regional State Administrative Agencies ended on 31 December 2025, when the (, LVV) was established on 1 January 2026.

Regions Satakunta (Satakunta/ Satakunta) Southwest Finland (Varsinais-Suomi/ Egentliga Finland)

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