Rennau

{{Infobox German location

|image_coa = Wappen Rennau.png

|coordinates = {{coord|52|18|N|10|55|E|format=dms|display=inline,title}}

||image_plan = Rennau in HE.svg

|state = Niedersachsen

|district = Helmstedt

|Samtgemeinde = Grasleben

|elevation = 114

|area = 22.6

|postal_code = 38368

|area_code = 05356 / 05365

|licence = HE

|Gemeindeschlüssel = 03 1 54 018

|divisions = 3

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

|mayor = Jörg Minkley

|party = CDU

}}

Rennau is a municipality in the district of Helmstedt, in Lower Saxony, Germany. The Municipality Rennau includes the villages of Ahmstorf, Rennau and Rottorf am Klei.

Ahmstorf um 1900 Postkarte.jpg|Old postcard of Ahmstorf

Rennau Stephanskirche.jpg|The Lutheran church in Rennau

Rottorf am Klei St. Marien.jpg|The Lutheran church in Rottorf am Klei