A slam dunk (or simply a dunk) is a type of basketball shot that is performed when a player jumps in the air and manually powers the ball downward through the basket with one or both of his hands over the rim. Merriam-Webster refers the term blank">"slam dunk" to the term "dunk shot", which is defined as "a shot in basketball made by jumping high into the air and throwing the ball down through the basket". M-W dates "slam dunk" at 1972, and "dunk shot" as "circa 1961". This is a standard _field goal worth two points. The term "slam dunk" was first coined by the late Los Angeles Lakers announcer Chick Hearn. Prior to that, it was known as a dunk shot.

The slam dunk is one of the highest percentage field goals one can attempt in basketball as well as one of the most crowd-pleasing plays. Other terms for slam dunk include "jam", "stuff", "flush", "cram" or "throw down." Slam dunk contests are quite popular, and perhaps the most popular contest is the NBA Slam Dunk Contest held during the annual NBA All-Star Weekend. The first slam dunk contest was held during an American Basketball Association All Star Game.

Dunking was banned in the NCAA from 1967 to 1976. Many have attributed this to the dominance of the then-college phenomenon Lew Alcindor (now called Kareem Abdul-Jabbar) upon his entry into the NCAA. Subsequently, the no-dunking rule is sometimes referred to as the "Lew Alcindor Rule."