Sitamarhi is a town and the district headquarters of Sitamarhi district, Mithila, India. It is a part of the Tirhut Division

Sitamarhi has suffered natural disasters, including excess flooding.The town was almost completely destroyed by the 1934 Nepal–Bihar earthquake.

Sitamarhi is located at 26.6°N 85.48°E. It has an average elevation of 56 metres (184 ft).

It is where the Mithila, Vajji (Licchvians) and Bhojpur regions of Bihar meet. Most of the people are either Maithils or Vajji but their culture is deeply affected by Bhojpur. Languages spoken are Hindi, English, Bajjika (Vajjika), Bhojpuri and Maithili. The local people used to speak Bajjika which resembles Maithili, Bhojpuri and Hindi—a consequence of its being surrounded by these languages.

Sama is a famous winter festival conducted by girls for the pleasure of their brothers. A major cultural event is the marriage ceremonies which take much preparation and many cultural rituals.

National Highway 77 connects the area to the Muzaffarpur district and Patna to the south. Sitamarhi has road connections to adjoining districts, of which the major examples are National Highway 77 and National Highway 104. State highways link it to Madhubani district in the east and Sheohar in the west.

The town is on the Darbhanga-Raxaul-Narkatiaganj railway line and has the largest railway station of district. The Darbhanga-Sitamarhi-Raxaul track was converted to broad gauge in February 2014. Another broad gauge track connects Sitamarhi to Muzaffarpur. Direct train services are available from Sitamarhi railway junction to places such as New Delhi, Kolkata, Varanasi, Lucknow, Hyderabad, Kanpur and Mumbai.

The nearest airport to Sitamarhi is the Jaiprakash Narayan International Airport which is about 120 kilometres (75 mi) distant.

Sitamarhi is connected to cities in and around Bihar by state-owned transport services. Some private buses operate between Patna to Sitamarhi and Paktola Village to Patna.

Sitamarhi has an All India Radio Relay station known as Akashvani Sitamarhi. It broadcasts on FM frequencies.

People of Sitamarhi are connected via social media with a famous page named as Sitamarhi. There are around 15000 members. Sitamarhi Facebook Family

There are two famous temples in Sitamarhi, Sita prakatya sthali at Punaura Dham and Janki Mandir in Sitamarhi town. It is believed that Maa Sita was born at Punaura dham and as it was raining heavily Raja Janak and his entourage rested at the place rightly known as Janki Mandir, Sitamarhi.

The place from where Raja Janak had started pluoghing the field is known as Haleshwar Sthan and it has ancient Shivling and temple.