The spreadeagle (also spelled spread eagle or spread-eagle) is the position in which a person has their arms outstretched and legs apart, figuratively resembling an eagle with wings spread. It is a style that appears commonly in nature and geometry. In human style, it is represented by the letter "X".

The spreadeagle position is frequently seen in various fields of human activity, particularly sports. It is commonly used in Olympic weightlifting, cheerleading, freestyle skiing, gymnastics, basketball, swimming and dance such as contemporary ballet. The spread eagle in figure skating is one of the moves in the field which makes the sport particularly associated with the position. It is also practiced in sky diving and appears in rock climbing and freestyle motocross.

The term spread eagle is used for sex positions where one of the partners adopts all or part of a spreadeagle position. One of the simplest versions has the lower partner lying on their back facing upwards (supine) with their arms and legs spread wide apart. It is a variant of the missionary position and it allows for deep sexual penetration. This position is also used for manual stimulation such as erotic massage of the G-spot or clitoral stimulation using the fingers or a sex toy. Clitoral stimulation can be performed by either partner and can be combined with penetrative sex. The position is also popular for oral sex which can be combined with vaginal massage. It is a comfortable position for the receiving partner to maintain, though the person providing the stimulation may experience neck discomfort. This may make it difficult for them to remain in place long enough for the receiving partner to reach orgasm.

There are a number of variations on the position. The reverse spreadeagle position is a less common version in which the lower partner lies facing down (prone). It is a variant of the doggy style position. If one leg is straight while the other is bent, the position is called the "broken eagle".

The variant known as the eagle or peace sign involves the lower partner lying on their back and holding their legs in the air spread wide apart in a "V" shape, though the arms are not usually spread. It is said to be better for stimulating the G-spot due to the angle of penetration. This can be done using a penis or a G-spot vibrator. The position is used for both vaginal and anal sex. The piledriver sex position, which is similar except that the lower partner's bottom is raised into the air to bring their feet close to the ground, can also be modified into a spread eagle version if the lower partner spreads their legs. This is sometimes called the soaring eagle.

The standing eagle variation adapts the spreadeagle to a vertical position. Typically the partner whose legs are spread is either pinned against a wall or stands on one leg and spreads the other. A variant exists that is easier for partners of different heights: one partner rests on the edge of a counter or bed with their legs spread while the other stands and penetrates them. Another vertical adaptation making use of furniture is the sofa spreadeagle: one partner stands on the edge of a bed or sofa or balances on two chairs and squats to allow for standing penetration.

The legs are also spread during the lesbian sexual practice known as scissoring.

The spread eagle position is also employed as a bondage position in BDSM play, with the submissive fastened to a bed, specially constructed table, sometimes face down or other equipment. The wrists and ankles are typically either fastened with ropes or with bondage cuffs attached to straps. Alternatively spreader bars are used to keep the wearer's legs or arms a set distance apart and produce a spread eagle position lying on the back or front.