diff --git a/Packages/Infrastructure/Sources/Public/Types/StructuredData.swift b/Packages/Infrastructure/Sources/Public/Types/StructuredData.swift
index 38d0acd..8ffb15b 100644
--- a/Packages/Infrastructure/Sources/Public/Types/StructuredData.swift
+++ b/Packages/Infrastructure/Sources/Public/Types/StructuredData.swift
@@ -65,6 +65,7 @@ public extension StructuredData {
     ///   - areaServed: the area the organization serves, or `nil` (the default) to omit its property.
     ///   - email: the address the organization is written to, or `nil` (the default) to omit its property.
     ///   - logo: the absolute URL of the organization's logo, or `nil` (the default) to omit its property.
+    ///   - inLanguage: the language codes the site is published in; empty (the default) to omit the property.
     ///   - profiles: the absolute URLs of the organization's public profiles, or empty (the default) to omit their property.
     ///   - founder: the `@id` of the `Person` node founding the organization, or `nil` (the default) to omit its property.
     init(
@@ -75,6 +76,7 @@ public extension StructuredData {
         areaServed: String? = nil,
         email: String? = nil,
         logo: String? = nil,
+        inLanguage: [String] = [],
         profiles: [String] = [],
         founder: String? = nil
     ) {
@@ -116,6 +118,19 @@ public extension StructuredData {
             organization.append(.init(.founder, value: .reference(founder)))
         }
 
+        var website: [Property] = [
+            .init(.name, value: .string(name)),
+            .init(.url, value: .string(url)),
+            .init(.publisher, value: .reference(id)),
+        ]
+
+        if !inLanguage.isEmpty {
+            website.append(.init(
+                .inLanguage,
+                value: .array(inLanguage.map(Value.string))
+            ))
+        }
+
         self.init(nodes: [
             .init(
                 type: .organization,
@@ -124,11 +139,7 @@ public extension StructuredData {
             ),
             .init(
                 type: .website,
-                properties: [
-                    .init(.name, value: .string(name)),
-                    .init(.url, value: .string(url)),
-                    .init(.publisher, value: .reference(id)),
-                ]
+                properties: website
             ),
         ])
     }
diff --git a/Packages/Infrastructure/Sources/Public/Types/StructuredData/StructuredDataProperty.swift b/Packages/Infrastructure/Sources/Public/Types/StructuredData/StructuredDataProperty.swift
index b311bdb..6ef5c1d 100644
--- a/Packages/Infrastructure/Sources/Public/Types/StructuredData/StructuredDataProperty.swift
+++ b/Packages/Infrastructure/Sources/Public/Types/StructuredData/StructuredDataProperty.swift
@@ -79,6 +79,8 @@ public extension StructuredData.Property.Name {
     static let email: Self = "email"
     /// The person who founded an organization.
     static let founder: Self = "founder"
+    /// The language a creative work — a site, a page — is published in.
+    static let inLanguage: Self = "inLanguage"
     /// The absolute URL of an organization's logo.
     static let logo: Self = "logo"
     /// The name of the thing a node describes.