| Official Name: | Big Branch, Louisiana |
| Pushpin Map: | Louisiana#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Louisiana |
| Subdivision Type2: | Parish |
| Subdivision Name2: | St. Tammany |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 16 |
| Coordinates: | 30.3339°N -89.9928°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 70445 |
| Area Code: | 985 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 560170 |
| Blank1 Name: | FIPS code |
| Blank1 Info: | 22-07255 |
Big Branch is an unincorporated community in St. Tammany Parish, Louisiana, United States. The community is located on U. S. Route 190 5miles southeast of Mandeville and 3.5 miles northwest of Lacombe.
The Big Branch Marsh National Wildlife Refuge lies along the coast of Lake Pontchartrain south of the community between Mandeville and Slidell.[1]