Kneel chairs or kneeling chair are a special type of chair designed for more ergonomic seating. The seat of the chair is positioned in such a way that the thighs are at an angle of sixty to seventy degrees while sitting. This is in contrast to the normal ninety degree angle in other chairs.

These chairs are supposed to be better than regular chairs as a lot of the body weight of the user is supported by the shins instead of the back. This significantly reduces the strain on the lower back by aligning the spine at a better angle. People with desk jobs who require to be seated in one place for long periods of time develop back problems from normal chairs. For them, kneel chairs are a better option since back problems are said to be reduced by using these chairs. Those with tailbone ache, coccyx problems or chronic back pains that arise due to sitting in the same position for hours can benefit a lot from kneeling chair.

A good quality kneeling chair opens up the body angle by lowering the lower body angle to keep the spine intact. The position is maintained in such a way that even if the person sitting on the chair leans inward, the body angle is at a constant ninety degrees or more. A common misconception with these chairs is that the body's weight is supported by the knees and people with bad knees will not be able to use the chair. However, the truth is that the weight is supported by the shins and not the knees, and the knee rests are just there to prevent the person from falling out of the chair. A majority of the weight is on the buttocks instead of the shins. This distributes the body weight more evenly and causes lesser problems.

The purpose of this type of seat is to mimic the position of the saddle of horseback riders whose postures are said to be the best for sitting in one place for long periods of time. Kneeling chair were designed in order to encourage people to sit in a better posture than what the regular chairs offered.