Wedding rings are most commonly worn on the fourth finger of the left hand in many Western countries, including the United States, Canada, and the United Kingdom. This tradition can be traced back to the Ancient Romans, who believed that the fourth finger on the left hand had a vein that ran directly to the heart, known as the "vein of love". However, there are some countries and cultures where wedding rings are worn on the right hand instead, including Russia, Poland, Norway, Austria, Denmark, Latvia, Bulgaria, Ukraine, Spain, and India.

Its important to note that there are no laws or rules dictating which finger a wedding ring should be worn on, and ultimately, the decision may come down to personal preference, tradition, or culture. In some cases, engagement rings may also be worn on the same finger as the wedding ring, either above or below it.

In summary, the most common finger for a wedding ring is the fourth finger of the left hand, but this can vary depending on the country or culture. Ultimately, the decision of which finger to wear a wedding ring on is a personal one.