Selargius

{{Infobox Italian comune

| name = Selargius

| official_name = Comune di Selargius

| native_name = Ceraxius

| image_skyline = SanLussorio.jpg

| imagesize =

| image_alt =

| image_caption = San Lussorio Church

| image_shield =

| shield_alt =

| image_map =

| map_alt =

| map_caption =

| pushpin_map = Italy Sardinia

| coordinates = {{coord|39|15|N|9|10|E|type:city(28,548)_region:IT|display=inline}}

| coordinates_footnotes =

| region = Sardinia

| metropolitan_city = Cagliari (CA)

| frazioni = Is Corrias, Su Pezzu Mannu, Su Planu

| mayor_party =

| mayor = Pier Luigi Concu

| area_footnotes =

| area_total_km2 = 26.67

| population_footnotes = {{cite web|title=Monthly Demographic Balance|url=https://demo.istat.it/app/?l=en&a=&i=D7B|publisher=ISTAT}}

| population_total = 28323

| population_as_of = 2025

| pop_density_footnotes =

| population_demonym = {{lang|sc|Ceraxinus}} (sc)
{{lang|it|Selargini}} (sc)

| elevation_footnotes =

| elevation_m = 10

|istat=092068| saint =

| day =

| postal_code = 09047

| area_code = 070

| website = {{official website|http://www.comune.selargius.ca.it/}}

| footnotes =

}}

Selargius, Ceràrgius or Ceraxius{{Cite web|url=http://files.splinder.com/42bb7f7bc54665556535074d5ccf0796.pdf|title=Delibera di Consiglio Comunale n. 95 del 13.10.2009|last=|first=|website=|url-status=dead|archive-url=https://web.archive.org/web/20111115145435/http://files.splinder.com/42bb7f7bc54665556535074d5ccf0796.pdf|archive-date=2011-11-15|access-date=2020-03-25}} in Sardinian, is a comune (municipality) in the Metropolitan City of Cagliari in the Italian region Sardinia, located about {{convert|6|km|mi|0}} northeast of Cagliari. It has 28,323 inhabitants as of 2025.

The village exists since the Middle Ages as part of the Cagliari Campidanu part of the Giudicato of Cagliari. In 1928 it was merged by the Cagliari commune but gained again its autonomy in 1947, after a local referendum. Selargius is part of the Cagliari metropolitan area.

Selargius borders the municipalities of Cagliari, Monserrato, Quartu Sant'Elena, Quartucciu, Sestu and Settimo San Pietro.