| Rivilganj | |
| Settlement Type: | Town |
| Pushpin Map: | India Bihar |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Bihar, India |
| Coordinates: | 25.78°N 84.67°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Bihar |
| Subdivision Type2: | District |
| Subdivision Name2: | Saran district |
| Unit Pref: | Metric |
| Elevation M: | 52 |
| Population Total: | 39,039 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Bhojpuri, Hindi |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code: | 841315 |
| Blank1 Name Sec1: | Lok Sabha constituency |
| Blank1 Info Sec1: | Saran |
| Blank2 Name Sec1: | Vidhan Sabha constituency |
| Blank2 Info Sec1: | Chapra |
Rivilganj is a town and one of the oldest nagar panchayat in Saran district in the Indian state of Bihar.
The Nagar Panchayat of Rivilganj is considered as one of the oldest Nagar Panchayat of Bihar.
Rivilganj was the birthplace of Mata Anjana, the mother of Hanuman, the bhakt (devotee) of Rama. This place is also known for Ahilya Uddhar (absolution). A temple devoted to Maharishi Gautam, also known as Gautam Sthan is located at Godna locality. A temple devoted to Kali Mata, also known as Kaliasthan is located at Baiju Tolla locality. There is also an ashram of Shringi Rishi in the municipality.
Rivilganj is located at .[1] It has an average elevation of 52 metres (170 feet). It is located at the confluence of the Ganges and Ghaghara (Sarayu) rivers.
India census,[2] Rivilganj had a population of 34,044. Males constitute 52% of the population and females 48%.