Emerald Germs of Ireland (2001) is a black comedy novel by Irish author Patrick McCabe.

The title "Emerald Germs of Ireland" is a reference to a music book, mentioned in McCabe's earlier novel The Butcher Boy titled "Emerald Gems of Ireland".

Through the use of flashbacks and hallucinations it tells of the alternately adoring and critical attention of his mother, Maimie, and the abusiveness of his father describing how it finally sent him over the edge.

After initially killing both his father and mother, he proceeds to kill his neighbors and local visitors to the village whom he believes to be aware of his crimes and attempt to blackmail him.

Eventually, after the removal of each successive "germ", he exhumes his mother's body as an act of closure.