Castell'Alfero

{{Infobox Italian comune

| name = Castell'Alfero

| official_name = Comune di Castell'Alfero

| native_name =

| image_skyline = Castellallfero.JPG

| imagesize =

| image_alt =

| image_caption =

| image_shield = Castell'Alfero-Stemma.svg

| shield_alt =

| image_map =

| map_alt =

| map_caption =

| pushpin_label_position =

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| coordinates = {{coord|44|59|N|8|13|E|type:city(2,736)_region:IT|display=inline,title}}

| coordinates_footnotes =

| region = Piedmont

| province = Asti (AT)

| frazioni = Callianetto, Stazione, Casotto, Serra Perno, Noveiva, Moncucco, Bricco Beretta

| mayor_party =

| mayor = Angelo Marengo

| area_footnotes =

| area_total_km2 = 20.0

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

| population_total = 2763

| population_as_of = 1 January 2016

| pop_density_footnotes =

| population_demonym = Castellalferesi

| elevation_footnotes =

| elevation_m = 235

| twin1 =

| twin1_country =

| saint = Sts. Peter and Paul

| day = First Sunday in September

| postal_code = 14033

| area_code = 0141

| website = {{official website|http://www.comune.castellalfero.at.it/}}

| footnotes =

}}

Castell'Alfero ({{langx|pms|Castel Alfé}}) is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about {{convert|40|km|mi}} east of Turin and about {{convert|9|km|mi|0}} north of Asti.

Castell'Alfero borders the following municipalities: Asti, Calliano, Corsione, Cossombrato, Frinco, Tonco, and Villa San Secondo.