Lahrs joins on August 1 from Christian Dior Couture, where he is managing director.
Lahrs has 12 years experience in global luxury goods at Christian Dior and LVMH.
Hugo Boss chairman, Dr Giuseppe Vita, said: "Claus-Dietrich Lahrs is the ideal choice for the position of chief executive of Hugo Boss. He is experienced in brand management in the premium and luxury segment of the fashion industry, he is internationally acting and he is a manager with great sales expertise. In total, he brings all management skills to the table in order to move Hugo Boss to the next level of success together with the other members of the managing board. We wish him good luck."
Lahrs added: "Hugo Boss is a great company acting in a true growth market. For me, the appointment as chief executive of Hugo Boss comes as the fulfillment of a life's dream. I look forward to coming into a powerful team, an outstanding market position and a plenitude of entrepreneurial opportunities. Together with all employees we can develop the strength of Hugo Boss even further and continue the growth story. I will use my experiences and contacts in the fashion industry to actively participate in such drive. It is my goal to generate even more international brand awareness in the big growth markets of Asia and the Americas. In that respect Hugo Boss has a great potential in all product categories."