Castelletto Merli

{{Infobox Italian comune

| name = Castelletto Merli

| official_name = Comune di Castelletto Merli

| native_name =

| image_skyline = Godio_chiesa.jpg

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| image_shield = Castelletto_Merli-Coat_of_Arms.png

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| coordinates = {{coord|45|4|N|8|14|E|type:city(499)_region:IT|display=inline,title}}

| coordinates_footnotes =

| region = Piedmont

| province = Alessandria (AL)

| frazioni = Borgo San Giuseppe, Case Bertana, Cosso, Costamezzana, Godio, Guazzolo, Perno Inferiore, Perno Superiore, Sogliano, Terfengato, Terfengo, Valle

| mayor_party =

| mayor = Ivan Cassone

| area_footnotes =

| area_total_km2 = 11.8

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

| population_total = 388

| population_as_of = 31 July 2014

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| population_demonym = Castellettesi

| elevation_footnotes =

| elevation_m = 268

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| postal_code = 15020

| area_code = 0141

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

| footnotes =

}}

Castelletto Merli is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about {{convert|40|km|mi}} east of Turin and about {{convert|35|km|mi}} northwest of Alessandria.

Castelletto Merli borders the following municipalities: Alfiano Natta, Cerrina Monferrato, Mombello Monferrato, Moncalvo, Odalengo Piccolo, and Ponzano Monferrato.