| Dalsinghsarai | |
| Settlement Type: | City |
| Pushpin Map: | India Bihar#India3 |
| Pushpin Map Caption: | Location in Bihar, India |
| Coordinates: | 25.6667°N 85.8333°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Bihar |
| Subdivision Type2: | Region |
| Subdivision Name2: | Mithila |
| Subdivision Type3: | Division |
| Subdivision Name3: | Darbhanga |
| Subdivision Type4: | District |
| Subdivision Name4: | Samastipur |
| Government Type: | Municipal Council |
| Governing Body: | Dalsinghsarai Municipal Council |
| Unit Pref: | Metric |
| Area Total Km2: | 17.65 |
| Elevation M: | 51.81 |
| Population Total: | 55562[1] |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Hindi[2] |
| Demographics1 Title2: | Additional official |
| Demographics1 Info2: | Urdu |
| Demographics1 Title3: | Regional Languages |
| Demographics1 Info3: | Maithili |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 848114 |
| Area Code: | 06278 |
| Area Code Type: | Telephone code |
| Registration Plate: | BR-33 |
| Leader Title: | Chief Councilor |
| Leader Name: | Abha Sureka |
| Leader Title1: | Deputy Chief Councilor |
| Leader Name1: | Sujata Choudhary |
| Leader Title2: | Executive Officer |
| Leader Name2: | Sushil Kumar Das |
| Leader Title3: | MP |
| Leader Name3: | Nityanand Rai (BJP) |
| Leader Title4: | MLA |
| Leader Name4: | Alok Kumar Mehta (RJD) |
| Blank3 Name Sec1: | Parliamentary Constituency |
| Blank3 Info Sec1: | 22-Ujiarpur |
| Blank4 Name Sec1: | Assembly Constituency |
| Blank4 Info Sec1: | 134-Ujiarpur |
Dalsinghsarai is a city and Municipal Council in the Samastipur District of Bihar, India. It is also one of the subdivisions and blocks of Bihar. It is situated on the bank of the river Balan.
Alok Kumar Mehta is the Member of the Legislative Assembly of Ujiyarpur constituency and Nityanand Rai is the Member of Parliament of Ujiyarpur.
The city was the center of indigo cultivation during British rule. In 1902, An Indigo Research Institute was opened nearby in Pusa.[3]
India census,[4] Dalsinghsarai Nagar Parishad has population of 55,562 of which 28,402 are males while 27,160 are females as per report released by Census India 2011. Population of children with age of 0–6 is 8640 which is 15.55% of total population of Dalsinghsarai.