"Siúil a Rúin" is a traditional Irish song, sung from the point of view of a woman lamenting a lover who has embarked on a military career, and indicating her willingness to support him. The song has English language verses and an Irish language chorus, a style known as macaronic.

Elizabeth "Bess" Cronin was an influential singer of Irish traditional music in the sean-nós style. She sang hundreds of songs which she learnt as a youth, half of which were in the Irish language, which was her first language. She was visited and recorded by prominent collectors of traditional music including Alan Lomax, Jean Ritchie, Peter Kennedy and Seamus Ennis. Some of her songs inspired popular recordings, such as her version of Siúil a Rún, which was covered by Clannad and Celtic Women.