The discus throw (pronunciation^ⓘ), also known as disc throw, is a track and field event in which the participant athlete throws an oblate spheroid weight – called a discus – in an attempt to mark a further distance than other competitors. It is an ancient sport, as demonstrated by the fifth-century-BC Myron statue Discobolus. Although not part of the current pentathlon, it was one of the events of the ancient Greek pentathlon, which can be dated back to at least 708 BC, and it is part of the modern decathlon.

The sport of throwing the discus traces back to it being an event in the original Olympic Games of Ancient Greece. The discus as a sport was resurrected in Magdeburg, Germany, by gymnastics teacher Christian Georg Kohlrausch and his students in the 1870s. Organized men's competition was resumed in the late 19th century, and has been a part of the modern Summer Olympic Games since the first modern competition, the 1896 Summer Olympics. Images of discus throwers figured prominently in advertising for early modern Games, such as fundraising stamps for the 1896 Games, and the main posters for the 1920 and 1948 Summer Olympics. Today the sport of discus is a routine part of modern track-and-field meets at all levels, and retains a particularly iconic place in the Olympic Games.

The first modern athlete to throw the discus while rotating the whole body was František Janda-Suk from Bohemia (the present Czech Republic). Janda-Suk invented this technique when studying the position of the statue of Discobolus. After a year of developing the technique, he earned a silver medal in the 1900 Olympics.

Women's competition began in the first decades of the 20th century. Following competition at national and regional levels, it was added to the Olympic program for the 1928 games.

The event consists of throwing a heavy disc, with the weight or size depending on the competitor. Men and women throw different sized discs, with varying sizes and weights depending on age. The weight of the discus is either governed by World Athletics for international or USA Track & Field for the United States.

In the United States, Henry Canine advocated for a lighter-weight discus in high school competition. His suggestion was adopted by the National High School Athletic Association in 1938.

The typical discus has sides made of plastic, wood, fiberglass, carbon fiber or metal with a metal rim and a metal core to attain the weight. The rim must be smooth, with no roughness or finger holds. A discus with more weight in the rim produces greater angular momentum for any given spin rate, and thus more stability, although it is more difficult to throw. However, a higher rim weight, if thrown correctly, can lead to a longer throw. In some competitions, a solid rubber discus is used (see in the United States).

To make a throw, the competitor starts in a circle of 2.50 m (8 ft 2+1⁄4 in) diameter, which is recessed in a concrete pad by 20 millimetres (0.79 in). The thrower typically takes an initial stance facing away from the direction of the throw. They then spin anticlockwise (for right-handers) 1+1⁄2 times while staying within the circle to build momentum before releasing the discus. The discus must land within a 34.92º circular sector that is centered on the throwing circle. The rules of competition for discus are virtually identical to those of shot put, except that the circle is larger, a stop board is not used and there are no form rules concerning how the discus is to be thrown.