Geilnau

{{Infobox German location

|image_coa = DEU Geilnau COA.svg

|coordinates = {{coord|50|20|58|N|7|55|38|E|format=dms|display=inline,title}}

|image_plan = Geilnau in EMS.svg

|state = Rheinland-Pfalz

|district = Rhein-Lahn-Kreis

|Verbandsgemeinde = Diez

|elevation = 98

|area = 2.25

|postal_code = 56379

|area_code = 06439

|licence = EMS, DIZ, GOH

|Gemeindeschlüssel = 07 1 41 045

|website = [https://www.geilnau.de/ www.geilnau.de]

|mayor = Friedhelm Rücker[https://www.wahlen.rlp.de/de/kw/wahlen/kd/gebiete/1410000000000.html Direktwahlen 2019, Rhein-Lahn-Kreis], Landeswahlleiter Rheinland-Pfalz, accessed 4 August 2021.

|leader_term = 2019–24

|party =

}}

Geilnau is a municipality in the district of Rhein-Lahn, in Rhineland-Palatinate, in western Germany. It belongs to the association community of Diez.