Alt Duvenstedt

{{Infobox German location

|image_photo = Matthäuskirche in Alt Duvenstedt.jpg

|imagesize =

|image_caption = Church in Alt Duvenstedt

|image_flag = Flagge Alt Duvenstedt.svg

|image_coa = DEU Alt Duvenstedt COA.svg

|coordinates = {{coord|54|21|30|N|9|38|40|E|format=dms|display=inline,title}}

|image_plan = Alt Duvenstedt in RD.png

|state = Schleswig-Holstein

|district = Rendsburg-Eckernförde

|Amt = Fockbek

|elevation = 8

|area = 20.43

|postal_code = 24791

|area_code = 04335, 04336, 04338

|licence = RD

|Gemeindeschlüssel = 01 0 58 003

|website = [http://www.fockbek.de/ www.fockbek.de]

|mayor = Peter Eichen

}}

Alt Duvenstedt is a municipality in the district of Rendsburg-Eckernförde, in Schleswig-Holstein, Germany.