"Danny Boy" is a song with lyrics written by English lawyer Frederic Weatherly in 1910, and set to the traditional Irish melody of "Londonderry Air" in 1913.

In 1910, in Bath, Somerset, England, the English lawyer and lyricist Frederic Weatherly initially wrote the words to "Danny Boy" to a tune other than "Londonderry Air".

Yet another story is that Frederic did not set the poem to any tune, but that, in 1913, Margaret, who, with her husband Edward Weatherly, was living at the Neosho mine near Ouray, Colorado, in the US, set it to the "Londonderry Air", which she had heard as a child in California played by her father and other Irish railway workers.

Jane Ross of Limavady is credited with collecting the melody of "Londonderry Air" in the mid-19th century from a musician she encountered.

Nonetheless, it is unclear whether this was Weatherly's intent,[7] and it is common practice for exactly the same lyrics to be used when sung by both women and men.