The Lefty's Deceiver is an artificial fly streamer pattern used in fly fishing for freshwater and saltwater species. The fly was originated by fly angler and author Lefty Kreh in the Chesapeake Bay for striped bass. The original fly was tied to resemble smelt, a common striped bass forage. The Deceiver is arguably the best known saltwater fly pattern in the world and in 1991 the U.S. Postal Service honored Kreh’s creation with a postage stamp.