The district of Una is located in the Himachal Pradesh state of India. Una is bordered by the districts of Hoshiarpur and Rupnagar in Punjab and the districts of Kangra, Hamirpur, and Bilaspur in Himachal Pradesh. The landscape is mostly flat with some semi-hilly areas.

In Una, there are five tehsils: Ghanari, Haroli, Amb, Bangana, and Una. It was a tehsil of the Kangra district until 1972, when it became a district of Himachal Pradesh, and a tehsil of the Hoshiarpur district until the Punjab Reorganisation Act of 1966.