In most Western cultures, including the United States and Canada, the wedding ring is traditionally worn on the fourth finger of the left hand, also known as the "ring finger." This tradition dates back to ancient times when it was believed that a vein in the ring finger, referred to as the "vena amoris" or "vein of love," connected directly to the heart.

However, in some cultures and countries, the wedding ring is worn on the right hand or a different finger. For example, in some European countries, the wedding ring is worn on the fourth finger of the right hand. In Jewish tradition, the wedding ring is placed on the index finger, and in some cultures, the ring is worn on the thumb.

Ultimately, the choice of which finger to wear the wedding ring on is a personal one and can vary based on individual preferences and cultural traditions.