Marcieu

{{Expand French|topic=geo|date=December 2009|Marcieu}}

{{Use dmy dates|date=August 2023}}

{{Infobox French commune

|name = Marcieu

|commune status = Commune

|image = Lac de monteynard plage de treffort DSCN4270.JPG

|caption = Monteynard Lake

|arrondissement = Grenoble

|canton = Matheysine-Trièves

|INSEE = 38217

|postal code = 38350

|mayor = Fabienne Prévot{{cite web|title=Répertoire national des élus: les maires|url=https://www.data.gouv.fr/fr/datasets/r/2876a346-d50c-4911-934e-19ee07b0e503|website=data.gouv.fr, Plateforme ouverte des données publiques françaises|date=2 December 2020|language=fr}}

|term = 2020–2026

|intercommunality =

|coordinates = {{coord|44.9156|5.6903|format=dms|display=inline,title}}

|elevation min m = 485

|elevation max m = 1729

|area km2 = 12

|population = {{France metadata Wikidata|population_total}}

|population date = {{France metadata Wikidata|population_as_of}}

|population footnotes = {{France metadata Wikidata|population_footnotes}}

}}

Marcieu ({{IPA|fr|maʁsjø}}) is a commune in the Isère department in southeastern France.