Vagnhärad is a locality situated in Trosa Municipality, Södermanland County, Sweden with 3,324 inhabitants in 2010.

Only one person was injured but a total of 29 houses were demolished and 96 people lost their homes in the effort of preventing future slides in the area.

[3] During the summer of 2011 new cracks in the ground were found in the area around Brovägen, also alongside the river, threatening approximately 20 more buildings.

The area around Vagnhärad is known for its many Stone Age burial mounds and archeological sites, as well as some old and unique runestones.

The locality was the model for "Hedeby" in Sven Delblanc's books Åminne (1970), Stenfågel (1973), Vinteride (1974) and Stadsporten (1976).