 "Unfaithful" debuted at number 51 on the US Billboard Hot 100 chart on May 13, 2006. The same week, Rihanna's previous single "SOS" reached number one. "Unfaithful" peaked at number 6 on July 22, 2006, after 10 weeks on the chart, and became Rihanna's third top ten single in the US. On July 29, 2006, "Unfaithful" also topped the US Hot Dance Club Songs chart, becoming her third number one there. The song was certified platinum by the Recording Industry Association of America (RIAA) on July 27, 2006, after more than one million downloads were shipped. "Unfaithful" was more successful in Canada where it reached number one on the Canadian Singles Chart. In Australia, the song entered the chart at number two, where it peaked, on July 30, 2006. It was later certified gold by the Australian Recording Industry Association (ARIA), denoting shipments of 35,000 copies. The same week, "Unfaithful" entered the New Zealand singles chart at number five. The next week, it peaked at number four where it stayed for three consecutive weeks.
