Joshua Paul "Josh" Mankiewicz (born August 27, 1955) is an American journalist, who has been reporting for Dateline NBC since 1995. He has reported for The Today Show, NBC Nightly News with Brian Williams, and Sunday Night with Megyn Kelly. Before moving to NBC, Mankiewicz worked as a producer and reporter for ABC News.

Although he has covered a wide variety of stories, he may be best known for his Dateline NBC report on the Atkins Diet. In the piece, he showed his personal progress on the diet, losing upwards of 47 pounds (21 kilograms). In 2006, in addition to his work as a correspondent, he was featured in "The Mank Blog", an irreverent look at what people are talking about online.