TUI Group is a German multinational travel and tourism company headquartered in Hanover, Germany. While it has a massive presence in the UK and operates "Marella Cruises" specifically for the British market, its corporate roots and stock exchange listings (MDAX) are firmly German. The name is an acronym for Touristik Union International, formed in 1968 by several German tour operators. Today, it is one of the world's largest integrated tourism groups, owning over 1,200 travel agencies, 400 hotels, and five airlines. In the UK, it famously rebranded from Thomson to TUI in 2017 to align with the global parent brand. In 2026, it remains a dominant force in European travel, providing end-to-end holiday experiences ranging from flight-only bookings to all-inclusive luxury beach resorts across 180 destinations.