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  This list of motor yachts by length, is a table of the world's longest active superyachts, with an overall length of at least  and up.
  These boats are also known as "megayachts", "gigayachts" and even "terayachts", usually depending on length. It has been generally accepted by naval architects and industry executives that superyachts range from 37 m (≈120 ft) to 60 m (≈200 ft), while those over 60 m are known as megayachts and boats over 90 m (≈300 ft) have been referred to as giga-yachts.
  The only legal distinction between boats above 24 m (78.75 ft) and below is that those above 24 m are viewed as a yacht and therefore must have a licensed skipper on board.