Ethel Mary Smyth (1858-1944) was an English composer and a leader of the women's suffrage movement.

She was born in London and studied music in Leipzig. Her works included symphonies, choral works and operas (most famously The Wreckers). However, possibly her best-known work was "The March of the Women" (1911), which became an anthem for the Women's Social and Political Union, to which she belonged.

In 1922, she was created a Dame of the British Empire.