"McNamara's Band" (originally "MacNamara's Band") is a popular song composed in 1889 by Shamus O'Connor (music) and John J. Stamford (lyrics). The song was performed as a music hall routine by William J. "Billy" Ashcroft. It has been recorded by a number of artists, most notably Bing Crosby. The song is associated with Ireland and often performed on St. Patrick's Day in the United States.