辣酱油，又称喼汁、乌酢、辣醋酱油、英国黑醋或伍斯特酱（Worcestershire sauce），是一种英国调味料，味道酸甜微辣，色泽黑褐。

最早，以及最著名的辣酱油品牌是英国的李派林（Lea & Perrins），于1838年始起发售至今。辣酱油是由药剂师李（John Wheeley Lea）和派林（William Henry Perrins）在伍斯特郡的郡府伍斯特的作坊制造，因此在英语，辣酱油称为“伍斯特郡酱汁”（Worcestershire sauce）。

今天，辣酱油虽然品牌繁多，但在英国生产的，只有李派林一种。

Worcestershire sauce (/ˈwʊstərʃər/), sometimes shortened to Worcester sauce (/ˈwʊstər/), is a fermented liquid condiment of complex mixture, of British origin from Worcester, and popularised by Lea & Perrins. The essential ingredients are barley malt vinegar, spirit vinegar, molasses, sugar, salt, anchovies, tamarind extract, onions, and garlic; particular brands add other spices as well to taste. It is often an ingredient in Welsh rarebit, Caesar salad, Oysters Kirkpatrick, and sometimes added to chili con carne, beef stew, hamburgers, and other beef dishes. Worcestershire sauce is also used to flavour cocktails such as a Bloody Mary or Caesar and to spice up appetizers like deviled eggs. Known as salsa inglesa (English sauce) in Spanish, it is also an ingredient in michelada, the Mexican beer cocktail.