Sant'Agata Fossili

{{Infobox Italian comune

| name = Sant'Agata Fossili

| official_name = Comune di Sant'Agata Fossili

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| image_skyline = Chiesa_di_Sant'Agata,_Sant'Agata_Fossili_-_panoramio.jpg

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| coordinates = {{coord|44|46|N|8|55|E|type:city(425)_region:IT|display=inline,title}}

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| region = Piedmont

| province = Province of Alessandria (AL)

| frazioni = Podigliano, Torre Sterpi, Giusolana

| mayor_party =

| mayor = Diego Camatti

| area_footnotes =

| area_total_km2 = 7.71

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

| population_total = 367

| population_as_of = 31 August 2022

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| population_demonym = Santagatesi

| elevation_footnotes =

| elevation_m = 425

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| postal_code = 15050

| area_code = 0131

| website = {{official website|http://www.comune.santagatafossili.al.it/}}

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}}

Sant'Agata Fossili is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about {{convert|100|km|mi}} southeast of Turin and about {{convert|30|km|mi}} southeast of Alessandria. As of 31 December 2004, it had a population of 425 and an area of {{convert|8.0|km2|mi2}}.

Sant'Agata Fossili borders the following municipalities: Carezzano, Cassano Spinola, Castellania Coppi, Sardigliano.