Red Cedar may refer to:

• Toona ciliata, a tree in the mahogany family native to Asia and Australia
• Toona sureni, a tree in the mahogany family native from South Asia to Papua New Guinea
• Juniperus virginiana, an eastern North American juniper
• Juniperus procera, an East African juniper
• Thuja plicata, a western North American tree in the cypress family

Canada

• Red Cedar Lake (Ontario), a lake in the Temagami region

United States

• Red Cedar, Wisconsin, a town in Dunn County
• Red Cedar (community), Wisconsin, an unincorporated community in Dunn County
• Red Cedar Lake (Wisconsin)
• Red Cedar River (Michigan), a tributary of the Grand River
• Red Cedar River (Wisconsin), a tributary of the Chippewa River
• Cedar River (Iowa River), also known as Red Cedar River, in Minnesota and Iowa

• The Red Cedar, an unrecognized humanitarian protection emblem proposed by Lebanon