| Tonstad herred | |
|---|---|
| Former Municipality | |
|   View of Tonstad in 1948 | |
| Location of the municipality | |
| Coordinates: 58°39′51″N 06°42′59″E / 58.66417°N 6.71639°ECoordinates: 58°39′51″N 06°42′59″E / 58.66417°N 6.71639°E | |
| Country | Norway | 
| Region | Southern Norway | 
| County | Vest-Agder | 
| District | Lister | 
| Municipality ID | NO-1046 | 
| Adm. Center | Tonstad | 
| Area | |
| • Total | 361 km2 (139 sq mi) | 
| Time zone | CET (UTC+01:00) | 
| • Summer (DST) | CEST (UTC+02:00) | 
| Split from | Sirdal in 1905 | 
| Merged into | Sirdal in 1960 | 
Tonstad is a former municipality in Vest-Agder county, Norway. The 361-square-kilometre (139 sq mi) municipality existed from 1905 until 1960. It encompassed the southern part of the present-day municipality of Sirdal. The administrative center of the municipality was the village of Tonstad where Tonstad Church is located.
The municipality of Tonstad was established on 1 January 1905 when the old municipality of Sirdal was divided into two municipalities: Tonstad (population: 828) and Øvre Sirdal (population: 753). On 1 January 1960, Tonstad (population: 651) was merged with Øvre Sirdal and the Øksendal area of Bakke to form a new municipality of Sirdal.
The municipality of Tonstad was named after the old Tonstad farm (Old Norse: Þornýjarstaðir ), since the church is located there. The first element of the name comes from the female name Tone (Old Norse: Þorný) and the last element is staðir which means "homestead" or "farm".