"When Irish Eyes Are Smiling" is a popular Irish song written by Chauncey Olcott and George Graff Jr. in 1912. The song expresses joy and warmth, celebrating the beauty of the Irish spirit and the happiness that comes from seeing a loved one smile. Its catchy melody and heartfelt lyrics have made it a favorite in both Irish and broader musical traditions. The song has been performed by many artists over the years, including Bing Crosby and John McCormack. It is often associated with Irish culture and is frequently sung at celebrations, such as St. Patrick's Day festivities, where it evokes a sense of nostalgia and pride in Irish heritage.