Robert Cullen (カレン・ロバート, Karen Robāto, born 7 June 1985) is a former Japanese footballer of Irish descent.

Cullen started training in the youth ranks at Kashiwa Reysol before eventually joining the team at Ichiritsu Funabashi High School.

Although mostly limited to substitute appearances and the occasional league cup start in his rookie year, big things were expected of Cullen as he matured and gained experience playing with such seasoned professionals as Masashi Nakayama and Toshiya Fujita.

He was a member of the Japan national U-20 team which played in the 2005 World Youth Championship held in the Netherlands.

[3] In February 2012 it was reported that Michael O'Neill had contacted Cullen with a view to convincing him to play for the Northern Ireland national team.