Swath or SWATH may refer to:

• Swath width, refers to the strip of the Earth’s surface from which geographic data are collected by a moving vehicle
• A strip cut out in mowing, respectively a track left clear in a field by the passage of different mowing/reaping tools or harvesting machines, e.g. by a swather
  • A windrow (synonym), a line or row of cut cropusually of hay, or strawleft on a field after mowing/reaping/harvesting, or formed afterwards
• Sequential Windowed Acquisition of All Theoretical Fragment Ion Mass Spectra (SWATH-MS), an acquisition type in mass spectrometry 
• Small-waterplane-area twin hull (SWATH), a type of ship design
• Snow White and the Huntsman, a dark fantasy action-adventure film based on the German fairy tale by the Brothers Grimm

A Small Waterplane Area Twin Hull, better known by the acronym SWATH, is a twin-hull ship design that minimizes hull cross section area at the sea's surface. Minimizing the ship's volume near the surface area of the sea, where wave energy is located, maximizes a vessel's stability, even in high seas and at high speeds. The bulk of the displacement necessary to keep the ship afloat is located beneath the waves, where it is less affected by wave action. Wave excitation drops exponentially as depth increases (Deeply submerged submarines are normally not affected by wave action at all). Placing the majority of a ship's displacement under the waves is similar in concept to creating a ship that rides atop twin submarines.