Lee–Enfield is a bolt-action, magazine-fed, repeating rifle that served as the main firearm used by the military forces of the British Empire and Commonwealth during the first half of the 20th century. It was the British Army's standard rifle from its official adoption in 1895 until 1957. The WWI versions are often referred to as the "SMLE," which is short for the common "Short Magazine Lee-Enfield" variant.

The Lee action cocked the striker on the closing stroke of the bolt ("Cock on Closing"), making the initial opening much faster and easier compared to the "Cock on Opening" (i.e., the firing pin cocks upon opening the bolt) of the Mauser Gewehr 98 design. The bolt has a relatively short bolt throw and features rear-mounted lugs and the bolt operating handle places the bolt knob just rearwards of the trigger at a favorable ergonomic position close to the operator's hand. The action features helical locking surfaces (the technical term is interrupted threading). This means that final head space is not achieved until the bolt handle is turned down all the way. The British probably used helical locking lugs to allow for chambering imperfect or dirty ammunition and that the closing cam action is distributed over the entire mating faces of both bolt and receiver lugs. This is one reason the bolt closure feels smooth. The rifle was also equipped with a detachable sheet-steel, 10-round, double-column magazine, a very modern development in its day. Originally, the concept of a detachable magazine was opposed in some British Army circles, as some feared that the private soldier might be likely to lose the magazine during field campaigns. Early models of the Lee–Metford and Lee–Enfield even used a short length of chain to secure the magazine to the rifle. To further facilitate rapid aimed fire the rifle can be cycled by most riflemen without loss of sight picture.

These design features facilitate rapid cycling and fire compared to other bolt-action designs like the Mauser. The Lee bolt-action and 10-round magazine capacity enabled a well-trained rifleman to perform the "mad minute" firing 20 to 30 aimed rounds in 60 seconds, making the Lee–Enfield the fastest military bolt-action rifle of the day. The current world record for aimed bolt-action fire was set in 1914 by a musketry instructor in the British Army—Sergeant Instructor Snoxall—who placed 38 rounds into a 12-inch-wide (300 mm) target at 300 yards (270 m) in one minute. Some straight-pull bolt-action rifles were thought faster, but lacked the simplicity, reliability, and generous magazine capacity of the Lee–Enfield. Several First World War accounts tell of British troops repelling German attackers who subsequently reported that they had encountered machine guns, when in fact it was simply a group of well-trained riflemen armed with SMLE Mk III rifles.

Standard Mk VII .303 inch cartridge for Lee–Enfield rifle
The Lee–Enfield was adapted to fire the .303 British service cartridge, a rimmed, high-powered rifle round. Experiments with smokeless powder in the existing Lee–Metford cartridge seemed at first to be a simple upgrade, but the greater heat and pressure generated by the new smokeless powder wore away the shallow, rounded, Metford rifling after approximately 6000 rounds. Replacing this with a new square-shaped rifling system designed at the Royal Small Arms Factory (RSAF) Enfield solved the problem, and the Lee–Enfield was born.

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