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One-Design is a racing method where all vehicles or boats have identical or very similar designs or models. It is also known as Spec series. It is heavily used in sailboat racing. All competitors in a race are then judged based off of a single start time.

As manufacturing technologies became more efficient and effective over the course of the 20th century, racers realized that there was an important need to equalize the design of the vehicles that they were competing in. The important factors being measured in One-Design racing help to equalize the vehicles and put more emphasis on the skill of the competitors.

One-Design is utilized in a variety of racing sports. Primarily it refers to sailing, where the One-Design Class Council creates, monitors, and enforces the rules that define what classes of sailboats are One-Design boats. It can additionally refer to airplanes or motor vehicles, such as IndyCars, where teams are required to meet certain specifications such as vehicle weight, engine displacement, weight, fuel capacity, and a variety of other factors are measured and regulated.

There are two primary methods of competition in sailboat racing: One-Design and handicap (see: Portsmouth Yardstick). One design refers to a racing class that consists of just one model or design of sailboat. In one-design racing, the first boat to finish wins the race. This is contrasted with handicap racing, where time is added or subtracted from the finishing times based on design factors and mathematical formulas to determine the winner. Having a rigid one-design specification keeps design experimentation to a mimimum and reduces cost of ownership. The popularity of one-design increased in the 1970s with the introduction of laminate construction using fiberglass reinforced plastic (FRP) and mold building technology. This process allowed the mass production of identical hulls of virtually any size at a lower price.

As a general rule, the tolerances are strictest in smaller boats like dinghy classes and small keelboats. All one-design classes will have a class association that will determine the measurement rules for the class. Olympic one-design classes have some of the strictest tolerances, for example Laser, Finn, Star, and the former Olympic class Soling.

For classes where the boats are physically smaller, this might mean that everything is designed and produced at the same factory, or by only licensed manufacturer in any country or region, so that all racing vehicles have identical parts. Examples of this include the Laser, Melges 24, Jet 14 or 49er boats.

In medium- to large-sized boat classes, One-Design would refer to conformance to a standard specification, with the possibility of alterations being allowed as long as they remained within certain tolerances. Examples of this are the J/24, Puddle Duck Racer, Tartan 10, Etchells, J105, and the Farr 40. After the hull length overall (LOA) exceeds 27 feet, people generally refer to the boat as an offshore one-design boat or yacht.

In other classes, the one-design class may have organized around an existing fleet of similar boats that traditionally existed together often for commercial purposes such as sailing canoes, dhows, and skipjacks, or boats that developed a common hull form over the years (such as A-Scows).

In contrast to 'one-design', other offshore sailboats race under a variety of handicapping rules and formulas developed to allow different type boats to compete against one another. Handicap rules include Portsmouth Yardstick, PHRF (originally Pacific Handicap Rule Formula, now Performance Handicap Rule Formula), IOR, IMS, IRC, Americap.