Rufiji is one of the 6 districts of the Pwani Region of Tanzania. It is bordered to the North by the Kisarawe and Mkuranga Districts, to the East by the Indian Ocean, to the South by the Lindi Region and to the West by the Morogoro Region.
The district name comes from the Rufiji River which runs through the district.
According to the 2002 Tanzania National Census, the population of the Rufiji District was 203,102. 
The Rufiji District is administratively divided into 19 wards: