Appen

{{For|the place in the Netherlands|Appen, Netherlands}}

{{For|the Australian company|Appen (company)}}

{{expand German|topic=geo|date=August 2020}}

{{Infobox German location

|image_photo =

|image_flag = Flagge Appen.png

|image_coa = DEU Appen COA.svg

|coordinates = {{coord|53|39|42|N|9|44|40|E|format=dms|display=inline,title}}

|image_plan = Appen in PI.svg

|state = Schleswig-Holstein

|district = Pinneberg

|Amt = Geest und Marsch Südholstein

|elevation = 6

|area = 20.26

|postal_code = 25480–25482

|area_code = 04101, 04122

|licence = PI

|Gemeindeschlüssel = 01 0 56 001

|divisions = 3

|website =

|mayor = Hans-Joachim Banaschak

|party =

}}

Appen is a municipality in the district of Pinneberg, in Schleswig-Holstein, Germany. It is situated approximately 3 km west of Pinneberg, and 20 km northwest of Hamburg.

It is twinned with the village of Polegate, near Eastbourne in East Sussex, England.

The municipality is known for its annual Appen musiziert benefit concerts.