diff --git a/changelog/fix-8232-deprecated-strtolower-on-order-received-page b/changelog/fix-8232-deprecated-strtolower-on-order-received-page
new file mode 100644
index 00000000000..f3b3df52ce6
--- /dev/null
+++ b/changelog/fix-8232-deprecated-strtolower-on-order-received-page
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+strtolower deprecation warning no longer appears on the Order Received and View Order pages when using PHP version 8.1+
diff --git a/includes/multi-currency/FrontendCurrencies.php b/includes/multi-currency/FrontendCurrencies.php
index fd38135b230..0c5fdf46821 100644
--- a/includes/multi-currency/FrontendCurrencies.php
+++ b/includes/multi-currency/FrontendCurrencies.php
@@ -111,12 +111,18 @@ public function init_hooks() {
 			// Currency hooks.
 			add_filter( 'woocommerce_currency', [ $this, 'get_woocommerce_currency' ], 900 );
 			add_filter( 'wc_get_price_decimals', [ $this, 'get_price_decimals' ], 900 );
-			add_filter( 'wc_get_price_decimal_separator', [ $this, 'get_price_decimal_separator' ], 900 );
 			add_filter( 'wc_get_price_thousand_separator', [ $this, 'get_price_thousand_separator' ], 900 );
 			add_filter( 'woocommerce_price_format', [ $this, 'get_woocommerce_price_format' ], 900 );
 			add_action( 'before_woocommerce_pay', [ $this, 'init_order_currency_from_query_vars' ] );
 			add_action( 'woocommerce_order_get_total', [ $this, 'maybe_init_order_currency_from_order_total_prop' ], 900, 2 );
 			add_action( 'woocommerce_get_formatted_order_total', [ $this, 'maybe_clear_order_currency_after_formatted_order_total' ], 900, 4 );
+
+			// Note: it's important that 'init_order_currency_from_query_vars' is called before
+			// 'get_price_decimal_separator' because the order currency is often required to
+			// determine the decimal separator. That's why the priority on 'init_order_currency_from_query_vars'
+			// is explicity lower than the priority of 'get_price_decimal_separator'.
+			add_filter( 'wc_get_price_decimal_separator', [ $this, 'init_order_currency_from_query_vars' ], 900 );
+			add_filter( 'wc_get_price_decimal_separator', [ $this, 'get_price_decimal_separator' ], 901 );
 		}
 
 		add_filter( 'woocommerce_thankyou_order_id', [ $this, 'init_order_currency' ] );
@@ -270,7 +276,16 @@ public function init_order_currency( $arg ) {
 			return $arg;
 		}
 
+		// We remove the filters here becuase 'wc_get_order' triggers the 'wc_get_price_decimal_separator' filter.
+		remove_filter( 'wc_get_price_decimal_separator', [ $this, 'get_price_decimal_separator' ], 901 );
+		remove_filter( 'wc_get_price_decimal_separator', [ $this, 'init_order_currency_from_query_vars' ], 900 );
 		$order = ! $arg instanceof WC_Order ? wc_get_order( $arg ) : $arg;
+		// Note: it's important that 'init_order_currency_from_query_vars' is called before
+		// 'get_price_decimal_separator' because the order currency is often required to
+		// determine the decimal separator. That's why the priority on 'init_order_currency_from_query_vars'
+		// is explicity lower than the priority of 'get_price_decimal_separator'.
+		add_filter( 'wc_get_price_decimal_separator', [ $this, 'init_order_currency_from_query_vars' ], 900 );
+		add_filter( 'wc_get_price_decimal_separator', [ $this, 'get_price_decimal_separator' ], 901 );
 
 		if ( $order ) {
 			$this->order_currency = $order->get_currency();
@@ -290,6 +305,10 @@ public function init_order_currency_from_query_vars() {
 		global $wp;
 		if ( ! empty( $wp->query_vars['order-pay'] ) ) {
 			$this->init_order_currency( $wp->query_vars['order-pay'] );
+		} elseif ( ! empty( $wp->query_vars['order-received'] ) ) {
+			$this->init_order_currency( $wp->query_vars['order-received'] );
+		} elseif ( ! empty( $wp->query_vars['view-order'] ) ) {
+			$this->init_order_currency( $wp->query_vars['view-order'] );
 		}
 	}