As of my knowledge cutoff in September 2021, here are some of the largest yachts in the world:
Azzam
Owned by Sheikh Khalifa bin Zayed Al Nahyan, the President of the United Arab Emirates, “Azzam” is currently the largest yacht in the world, measuring 180.6 meters (592 feet) in length.
Fulk Al Salamah
This yacht, owned by the Saudi Arabian Royal Family, is approximately 164 meters (538 feet) long.
Eclipse
Owned by Russian billionaire Roman Abramovich, “Eclipse” measures around 162.5 meters (533 feet) in length.
Dubai
Owned by Sheikh Mohammed bin Rashid Al Maktoum, the ruler of Dubai, “Dubai” has a length of approximately 162 meters (531 feet).
Lürssen Yacht
With an undisclosed name, this 156-meter (512-foot) yacht is privately owned.
Please note that the rankings and sizes of the largest yachts can change over time, as new yachts are constructed and existing ones are extended. It’s always a dynamic and competitive industry. For the most up-to-date information, it is advisable to consult reliable sources or specialized publications that cover the luxury yacht industry