Yamuna Nagar district () is one of the 21 districts of Haryanastate, India. The district came into existence on 1 November, 1989. It occupies an area of 1756 km². Yamunanagar town is the district headquarters.
The district comprises three tehsils: Jagadhri, Chhachhrauli and Bilaspur. These are further divided into six development blocks: Bilaspur, Sadhaura, Mustafabad, Radaur, Jagadhri and Chhachhrauli.
There are four Vidhan Sabha constituencies in this district: Sadhaura, Jagadhri, Yamunanagar and Radaur. While Sadhaura, Jagadhri and Yamunanagar are part of Ambala Lok Sabha constituency, Radaur is part of Kurukshetra Lok Sabha constituency.
The district has a population of 1,041,630 (male 559,444 and female 482186).a