Piraeus (regional unit)

{{Infobox Greece place

| name = Piraeus

| name_local = Περιφερειακή ενότητα
Πειραιώς

| type = regional unit

| image_skyline = 2011 Dimi Perifereiakis enothtas Pirea numbered.svg

| caption_skyline = Municipalities of Piraeus

| image_map = PE Pireos in Greece.svg

| map_caption = Piraeus within Greece

| coordinates = {{coord|37|58|N|23|38|E|display=inline,title}}

| periph = Attica

| seat = Piraeus

| area = 50.4

| elevation =

| population = 448051

| population_as_of = 2021

| demonym =

| postal_code =

| area_code = 210

| licence =

| website =

}}

Piraeus ({{IPAc-en|p|aɪ|ˈ|r|iː|ə|s|,_|p|ɪ|ˈ|r|eɪ|ə|s}} {{respell|py|REE|əs|,_|pirr|AY|əs}}; {{langx|el|Περιφερειακή ενότητα Πειραιώς|Perifereiakí enótita Peiraiós}}), also sometimes called Greater Piraeus{{cite book|author=Elaine Thomopoulos|title=The History of Greece|work=The Greenwood Histories of the Modern Nations|publisher=Greenwood|year=2012|page=6}} (as distinct from the City of Piraeus; {{lang|el|Ευρύτερος Πειραιάς}} Evrýteros Peiraiás), is one of the regional units of Greece. It is part of the region of Attica. The regional unit covers the west-central part of the Athens urban area (or agglomeration).