Troy Donockley is an English composer and multi-instrumentalist most known for his playing of Uilleann pipes. Having performed with many artists as a session player, he is most notable as a member of Finnish symphonic metal band Nightwish, which he has performed with since 2007 and joined as a full-time member in 2013.

The uilleann pipes, sometimes called Irish bagpipes, are the characteristic national bagpipe of Ireland. Earlier known in English as "union pipes", their current name is a partial translation of the Irish language terms píobaí uilleann, from their method of inflation. There is no historical record of the name or use of the term uilleann pipes before the 20th century. It was an invention of Grattan Flood and the name stuck. People mistook the term 'union' to refer to the 1800 Act of Union; however, this is incorrect as Breandán Breathnach points out that a poem published in 1796 uses the term 'union'.