Stevie Wonder won 15 Grammy Awards during the 1970s.
The decade was the most concentrated period of Grammy success in his career. His major album sequence included Talking Book, Innervisions, Fulfillingness’ First Finale and Songs in the Key of Life, all released between 1972 and 1976. These albums produced awards in categories including Album of the Year, Best Male Pop Vocal Performance and Best Rhythm and Blues Song.
Wonder won Album of the Year three times during the decade: for Innervisions at the 1974 ceremony, Fulfillingness’ First Finale at the 1975 ceremony and Songs in the Key of Life at the 1977 ceremony. Those victories made him the first artist to win that award three consecutive times.
The total of 15 refers to Grammy wins in the 1970s, not his career total. He continued receiving Grammys in later decades, so decade-specific counts should not be confused with his lifetime number of awards.