The Autoroute 6, abbreviated to A6 or otherwise known as the Arlon motorway (, ), is a motorway in southern and western Luxembourg. It is long and connects Luxembourg City, in the south, to Kleinbettingen, in the west. It reaches the Belgian border at Kleinbettingen, whereupon it meets the A4, which leads to Brussels via Arlon and Namur.
The A6 forms part of the E25 from Hook of Holland in the Netherlands to Palermo in Italy.
The A6 was opened in three separate sections: