Siamanna

{{Infobox Italian comune

| name = Siamanna

| official_name = Comune di Siamanna

| native_name =

| image_skyline =

| imagesize =

| image_alt =

| image_caption =

| image_shield =

| shield_alt =

| image_map =

| map_alt =

| map_caption =

| pushpin_map = Italy Sardinia

| coordinates = {{coord|39|55|N|8|46|E|type:city(842)_region:IT|display=inline,title}}

| coordinates_footnotes =

| region = Sardinia

| province = Oristano (OR)

| frazioni = Pranixeddu

| mayor_party =

| mayor = Franco Vellio Melas

| area_footnotes =

| area_total_km2 = 28.36

| population_footnotes = All demographics and other statistics: Italian statistical institute Istat.

| population_total = 811

| population_as_of = 28 February 2017

| pop_density_footnotes =

| population_demonym = Siamannesi

| elevation_footnotes =

| elevation_m = 100

| saint =

| day =

| postal_code = 09080

| area_code = 0783

| website = {{official website|http://www.comune.siamanna.or.it/}}

| footnotes =

}}

Siamanna is a comune (municipality) in the Province of Oristano in the Italian region Sardinia, located about {{convert|80|km|mi}} northwest of Cagliari and about {{convert|15|km|mi|0}} east of Oristano.

Siamanna borders the following municipalities: Allai, Oristano, Ruinas, Siapiccia, Simaxis, Villaurbana.