Hollis Ellsworth Dann (May 1, 1861 – January 3, 1939) was an American music educator and choral director during the early twentieth century.

In 1887, Dann was hired to teach penmanship in the public schools in Ithaca, New York with the promise that he could also begin instruction in music.

In 1889, Dann became director of the Cornell University Glee Club, a position he would hold for 32 years.

On this tour, the men were hosted by the Savage Club of London, and a similar organization was founded in Ithaca upon their return.

In 1918, Dann took a leave of absence from Cornell to serve as the Army Song Leader in Louisville, Kentucky.

He also edited a popular school hymnal and a songbook of Christmas carols, possibly the first to publish the music and lyrics together for "It Came Upon a Midnight Clear".