Joseph Djimrangar Dadnadji (1 January 1954 – 31 December 2019) was a Chadian politician. He became Prime Minister of Chad in 2013 after the resignation of Emmanuel Nadingar. His term would only last for 10 months before his resignation. He was succeeded by Kalzeubet Pahimi Deubet.
Dadnadji died of a stroke on 31 December 2019 in N'Djamena, Chad at the age of 65.