Mega yachts are the diamonds of the oceans and try to outshine one another on a number of grounds. Some mega yachts claim the title of greatness for sheer enormity, while others compete for luxury, and still others for expense. The exact measurements of any given vessel can vary and for mega yachts still under construction, the measurements are sometimes hypothesized or approximated. Mega yachts still under construction do not always make the list and sometimes state-owned yachts are excluded.
The following top lists for luxury yachts and mega yachts have been retrieved from a variety of publications, including Forbes Magazine and Power and Motor Yacht. Listings are sometimes subjective.