Arieh O'Sullivan (Hebrew: אריה אוסליבן; born March 22, 1961) is an author, journalist, soldier, and defense correspondent who has covered Israel and the Middle East for over two decades.

He was the Bureau Chief of The Media Line, a non-profit American news agency covering the Middle East August 2009-July 2012.

[8][12] He is best known for his former role as a defense correspondent and analyst for The Jerusalem Post, the Middle East's leading English-language daily,[13] where he worked for over 10 years.

[14] He appears as a guest commentator on a variety of world radio and television news programs and has reported from the Rwanda, the Palestinian territories, Kosovo, Northern Ireland, Lebanon, Turkey, and China.

[13] O'Sullivan is a founding member of the ecological village of Srigim in the Elah Valley in central Israel.