| Gahna | |
| Settlement Type: | Village |
| Pushpin Map: | India Bihar#India |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Bihar, India |
| Coordinates: | 25.03°N 84.4°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Bihar |
| Subdivision Type2: | District |
| Subdivision Name2: | Aurangabad |
| Named For: | Kamran Khan S/O Md Fattah Khan |
| Government Type: | Village |
| Unit Pref: | Metric |
| Elevation M: | 90 |
| Population Total: | 2522 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code: | 824120 |
| Iso Code: | IN-BR |
Gahna is a village under Haspura block, Aurangabad district of Bihar, India.
Gahna is a village in Aurangabad District of Bihar, India. It is located 48 km north from District headquarter Aurangabad, 4 km north from Haspura and 90 km south from Patna. Area wise it is the average village of district Aurangabad and is designated as ideal village. Gahna Pin code is 824120 and postal head office is Haspura.[1]