"I Wonder Why" is a song by American singer and songwriter Curtis Stigers, released on August 12, 1991 in the United States by Arista Records as the first single from his eponymous debut album (1991). The song is written by Stigers with Glen Ballard, who also produced it. It reached number four on the Danish and Irish singles charts, number five on the UK Singles Chart, and number nine on the US Billboard Hot 100. The single also reached the top 10 in Belgium, Denmark, Germany, the Netherlands, and Norway.