| Jhajhar | |
| Settlement Type: | Village |
| Pushpin Map: | India Rajasthan#India |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Rajasthan, India |
| Coordinates: | 27.86°N 75.28°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Rajasthan |
| Subdivision Type2: | District |
| Subdivision Name2: | Jhunjhunu |
| Unit Pref: | Metric |
| Elevation M: | 379 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Hindi |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 333 304 |
| Area Code Type: | Telephone code |
| Area Code: | 91-1594 |
| Registration Plate: | RJ-18 |
| Iso Code: | RJ-IN |
Jhajhar is a village, situated in the erstwhile province of Shekhawati of Rajasthan, India. It is located in the Jhunjhunu District, approximately 7 km from Nawalgarh. Formally it was the part of Pentalisa of Bhojyana.
The Jagir of Jhajhar with other villages was granted to the Purshottam Singh, elder son of Thakur Todar Mal, ruler of Udaipurwati. Singh had three wives (amongst others), 3rd, was Phool Kanwar Mertani. He was succeeded by his son Prithvi Singh as the Thakur of Jhajhar, he married 1st, Biki, married 2ndly, Biki, married 3rdly, Udawat. He died fighting in the battle of Devli and Heerapura, north of Sambhar.[1] He had four sons, after his death Jhajhar was divided into Chaar Panas (four parts). Due to the influence of the Shekhawats, no incident of theft or robbery happened under their rule in Jhajhar. The Shekhawat Sirdars of Jhajhar were the Bhomias (Landlords). Thakurs of Jhajhar paid allegiance to their overlords, the Maharajas of Jaipur, which was collected from Udaipurwati.
The Thakurs of Jhajhar belongs to Shekhawat sub clan (Bhojraj Ji Ka) of Kachwaha Dynasty of Jaipur.Group of 45 villages of Udaipurwati was popularly known as Pentalisa. Jhajhar was one of them.
Bhairubas is in Karan Singh Ji Ka Pana of Jhajhar, located 1 km from Jhajhar. Bhairubas named after Bhairu Singh of Jhajhar.
Teej, Gangaur, Holi, Dussehra, Janmashtmi, Navratri and Diwali are celebrated in the village. The Rajputs and Mali specially celebrated the Dassehra and Gangaur. Gangaur is celebrated by Rajput ladies. The women dance the Ghoomar, every night for five nights. Isar and Gangaur are bedecked and displayed in every noble house all over Rajasthan. The festival is celebrated like a wedding.
Mohini sati mata bhadava ka mela.and the specially function performed by the party the siddhi vinayak shri ganesh temple.Sri Shaligramji Laddu Gopal Mandir Mandir celebrates Shivratri, Holi Utsav, Janmashtami, Sarad Purnima, Ankoot Mahotsav succeeding Deepawali.