The Pratt knot is a method of tying a necktie. It is also known as the Shelby knot.^[1][2][3] The knot was created by Jerry Pratt, an employee of the US Chamber of Commerce in the late 1950s.^[4] It was popularized as the Shelby knot after then 92-year-old Pratt taught it in 1986 to television reporter Don Shelby who he felt had been tying his tie poorly on the air.^[5] Shelby then refined the Pratt knot with local clothier Kingford Bavender and wore it on the air with a spread collar where it stood out and attracted attention for its symmetry and trim precision.^[6]

The knot is a variation on the Nicky knot. Both the Pratt and Nicky knots are tied inside out, though only the Nicky knot is self-releasing. Before its popularization in a 1989 New York Times article, the knot was unknown within the fashion world and not recorded in the tie industry's standard reference guide of the time, Getting Knotted – 188 Knots for Necks by Davide Mosconi and Riccardo Villarosa in Milan, Italy.^[6][7]

The Pratt knot uses less length than the half-Windsor or Windsor knots, and so is well suited to shorter ties or taller men. Unlike the four-in-hand knot, the Pratt method produces a symmetrical knot. It is of medium thickness.

Using notation from and according to The 85 Ways to Tie a Tie, the knot is tied

• Lo Ci Lo Ri Co T (knot 5).

• List of knots

• Encyclopedia of tie knots at Thomas Fink's homepage
• Grog. "Pratt (Shelby) tying guide". Animated Knots.
• Pratt (Shelby) tying guide at TieGuide.com
• Neckties at Curlie