Kieran Culkin (born September 30, 1982 in New York City, New York) is an American actor.
The brother of child actor Macaulay Culkin, Kieran Culkin debuted at the age of eight in a small role alongside his starring brother in Home Alone. He played his brother's cousin, Fuller. Kieran continued acting as a child and teenager, mainly working in comedy films, including Home Alone 2: Lost in New York and Father of the Bride and its sequel. As a teenager, Kieran switched between lead roles in independent films, and small parts in mainstream films. His most notable role to date was probably the lead in the well received art house film, Igby Goes Down, for which Kieran was nominated for a Golden Globe Award. Kieran has also acted in the Oscar nominated movie Music of the Heart, a film based on the life of Roberta Guaspari, a violin teacher.