Casalvieri

{{Infobox Italian comune

| name = Casalvieri

| official_name = Comune di Casalvieri

| native_name =

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| coordinates = {{coord|41|38|N|13|43|E|type:city(3,177)_region:IT|display=inline,title}}

| coordinates_footnotes =

| region = Lazio

| province = Frosinone (FR)

| frazioni = Purgatorio, Roselli

| mayor_party =

| mayor = Franco Moscone

| area_footnotes =

| area_total_km2 = 27.27

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

| population_total = 2383

| population_as_of = 30 December 2020

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| population_demonym = Casalvierani

| elevation_footnotes =

| elevation_m = 380

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| saint = St. Honorius

| day = May 31

| postal_code = 03034

| area_code = 0776

| website = {{official website|http://www.comune.casalvieri.fr.it}}

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Casalvieri (Campanian: {{lang|nap|Casaluere}}) is a comune (municipality) in the Province of Frosinone in the Italian region Lazio, located about {{convert|110|km|mi}} southeast of Rome and about {{convert|30|km|mi}} east of Frosinone.

Casalvieri borders the following municipalities: Alvito, Arpino, Atina, Casalattico, Fontechiari, Vicalvi.