Belle Alliance is an unincorporated community in Assumption Parish, Louisiana, United States.

Belle Alliance is named after the Belle Alliance Plantation[1] located on the east bank of Bayou Lafourche in Assumption Parish, about five miles (8 km) out of Donaldsonville.

During the 1770s, this 7,000-acre (28 km2) plot was granted to Don Juan Vives, a physician and military officer of the Spanish government.

[2] The actual Belle Alliance Plantation was built by a successful sugar planter Charles Anton Kock, also owner of St. Emma Plantation around 1846.

The plantation is listed on the National Register of Historic Places.