Tenet will be in the classroom starting next fall but will take up his position immediately, the University said in a statement.
Tenet graduated from Georgetown's School of Foreign Service in 1976. He will be a professor in diplomacy and a senior research associate at the Institute for the Study of Diplomacy.
Tenet, who left the agency after seven years in July, is working on a book and accepting speaking engagements.
In February, Tenet chose Georgetown as the forum for a fierce defense of the intelligence agencies' analyses on Iraq before President Bush ordered the invasion in March 2003. "They never said there was an imminent threat," Tenet said in his speech.
Tenet also made clear his devotion to the school and its basketball team. "It's always great to be back at a place I love, the greatest university in America," he said.