Julius W. Blackwell (born c. 1797; death date unknown) was an American politician and a member of the United States House of Representatives that represented fourth and third districts of Tennessee in the United States House of Representatives.
Blackwell was born in Virginia in approximately 1797 and attended the public schools.
He moved to Tennessee and settled in Athens, McMinn County.
After the number of electoral districts Tennessee held had been reduced and reapportioned, he was elected by Tennessee's third district to the Twenty-eighth Congress, which lasted from March 4, 1843, to March 3, 1845.
The date, and the location of his death is unknown as well as the place of his interment.