diff --git a/app/models/account.rb b/app/models/account.rb
index 95c826779..85754a395 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -85,6 +85,7 @@ class Account < ApplicationRecord
   validates_with JsonSchemaValidator,
                  schema: SETTINGS_PARAMS_SCHEMA,
                  attribute_resolver: ->(record) { record.settings }
+  validate :validate_reporting_timezone
 
   store_accessor :settings, :auto_resolve_after, :auto_resolve_message, :auto_resolve_ignore_waiting
 
@@ -215,6 +216,12 @@ class Account < ApplicationRecord
     # method overridden in enterprise module
   end
 
+  def validate_reporting_timezone
+    return if reporting_timezone.blank? || ActiveSupport::TimeZone[reporting_timezone].present?
+
+    errors.add(:reporting_timezone, I18n.t('errors.account.reporting_timezone.invalid'))
+  end
+
   def remove_account_sequences
     ActiveRecord::Base.connection.exec_query("drop sequence IF EXISTS camp_dpid_seq_#{id}")
     ActiveRecord::Base.connection.exec_query("drop sequence IF EXISTS conv_dpid_seq_#{id}")
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 0c89f3e7d..5034f5567 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -48,6 +48,9 @@ en:
     inbox_deletetion_response: Your inbox deletion request will be processed in some time.
 
   errors:
+    account:
+      reporting_timezone:
+        invalid: is not a valid timezone
     validations:
       presence: must not be blank
     webhook:
diff --git a/spec/models/account_spec.rb b/spec/models/account_spec.rb
index 5ccff6517..3da958188 100644
--- a/spec/models/account_spec.rb
+++ b/spec/models/account_spec.rb
@@ -217,6 +217,21 @@ RSpec.describe Account do
         expect(described_class.with_auto_resolve.pluck(:id)).not_to include(account.id)
       end
     end
+
+    context 'when reporting_timezone is set' do
+      it 'allows valid timezone names' do
+        account.reporting_timezone = 'America/New_York'
+
+        expect(account).to be_valid
+      end
+
+      it 'rejects invalid timezone names' do
+        account.reporting_timezone = 'Invalid/Timezone'
+
+        expect(account).not_to be_valid
+        expect(account.errors[:reporting_timezone]).to include(I18n.t('errors.account.reporting_timezone.invalid'))
+      end
+    end
   end
 
   describe 'captain_preferences' do