| Andar | |
| Settlement Type: | CD Block |
| Pushpin Map: | Bihar |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Bihar, India |
| Coordinates: | 26.1018°N 84.2905°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Bihar |
| Subdivision Type2: | District |
| Subdivision Name2: | Siwan |
| Subdivision Type3: | Subdivision |
| Subdivision Name3: | Siwan |
| Seat Type: | Headquarters |
| Seat: | Andar (town) |
| Governing Body: | Andar block |
| Unit Pref: | Metric |
| Area Total Km2: | 120.41 |
| Population Total: | 110027 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Bhojpuri, Hindi, Urdu, English |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Area Code Type: | Telephone code |
| Blank1 Name Sec1: | Sex ratio |
| Blank1 Info Sec1: | 919 per 1000 ♂/♀ |
Andar is a community development block and a town in Siwan district of Bihar in India. It is one of 13 blocks of Siwan subdivision. The headquarters of the block is located in Andar town.
The total area of the block is 120.41km2 and the total population is 110,027.[1] Andar block is divided into many villages and they are grouped into gram panchayats.
List of panchayats in Andar block:[2]