Ernest R. Ball (July 22, 1878 – May 3, 1927) was a United States singer and songwriter, most famous for composing the music for the song "When Irish Eyes Are Smiling" in 1912. He was not, himself, Irish.
Born in Cleveland, Ohio, Ball received formal music training at the Cleveland Conservatory. His nascent career was much buoyed by James J. Walker, then a state senator of New York, who asked Ball to write music for some lyrics he wrote. Ball did, and the song "Will You Love Me In December as You Do In May?" became a hit. Walker later became known as "Dapper Jimmy Walker", Mayor of New York City, a fortunate event for Ball's career.
Ball accompanied singers, sang in vaudeville and wrote sentimental ballads, mostly with Irish themes. He collaborated with Chauncey Olcott on many songs including "When Irish Eyes are Smiling," for which Olcott composed lyrics. He became a charter member of ASCAP in 1907, and wrote many American standards. He was also a fine pianist, and his playing is preserved on several piano roll recordings he made for the Vocalstyle company, based in his home state of Ohio.