The Curious Incident of the Dog in the Nightdress is a 2006 novel by Irish journalist and author Paul Howard, and the fifth in the Ross O'Carroll-Kelly series.

Ross O'Carroll-Kelly is a satirical fictional Irish character, a wealthy South County Dublin rugby union jock created by journalist Paul Howard. The character first appeared in a January 1998 column in the Sunday Tribune newspaper and later transferred to The Irish Times. The series comprises twenty-one novels, three plays, a CD, two other books, a weekly podcast, and the newspaper column, as of 2023.